I use them, work great. You have to make sure to remove or upgrade (preferably remove) any splitters along the way. Older coax splitters don’t support higher bandwidths.
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Based on what you wrote, you seem very confident in your conclusion that RAAT is the inherent constraint, and not your network. Also based on what you wrote, you haven’t actually explored the possibility that the root cause is your particular WiFi implementation, rather than RAAT itself. That is not to say that RAAT does simply require more from the network than Chromecast/AirPlay, but if that’s an accurate characterization, “more demanding” would be a significantly different diagnosis from “less stable”.
In my experience using a mix of wired and wireless endpoints, and employing Chromecast as well as RAAT (sometimes even switching between the two on the same device in some cases), it is not at all evident that RAAT is inherently unstable on WiFi. It looks like other responders would make similar attestations, and that would suggest that the conclusion you seemed to have reached might not be correct, whether evident or not. And please heed the posts about mesh networks (granted, I don’t think you described your network anywhere) - this topology effectively addresses challenges where wired access points are not possible, but it does not guarantee that a multi-access point network won’t have bottlenecks/latency. If anything, the opposite is more likely.
Are these your only comps over the same network: Chromecast vs AirPlay vs RAAT and audio vs Ultra HD video? Or was there more that went into the conclusion?
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A year ago we bought a new TV , while we were plumbing it in we decorated the room so I was forced onto WiFi or nothing ,
My Naim Unity Atom HE behave perfectly even on 24/192 , never as much as a blip.
I would never recommend WiFi but Naim’s implementation along with RAAT is obviously good
Not all WiFi is born equal 
This is such a poor take. Responses like this also highlights why support is also just as bad, and why this community can be toxic.
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Why are you still using Roon? You’ve been around a few years. Maybe Apple Music or Spotify would work better for you. You seemed disappointed that they were not integrated with Roon in some of your early post almost three years ago.
You obviously haven’t seen the episode of Top Gear where they take a Bentley Continental GT rallying
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There’s nothing a rental car cannot do. 
Top Gear 
WiFi works great at both my homes, one Apple, one tplink deco mesh.
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My experiences with RAAT are pretty much it depends on the connections that you are using.
When I first started out with Roon, I was mostly using WiFi connections in my apartment. Dual router setup. ISP router where the cable Internet connection came in. And my own ASUS router which is connected through Ethernet with the ISP one. From there it was mostly WiFi onwards having the ASUS handle all the network traffic. I’ve bought the ASUS as the WiFi from the ISP’s modem has a tendency to drop a lot for short periods of time, resulting in disconnects. The ASUS is rocksolid.
This system worked fine with pretty much everthing except for Roon. Many dropouts. So I got my Mac mini which runs my Roon Server connected to Ethernet and the dropsouts pretty much vanished. Only my Cambridge CXNv2 seems to be quite prone to dropouts when using WiFi so it is now hardwired to Ethernet as well. And never had any issues with it anymore. My Bluesound Node X does play happily all day using WiFi. So it does seem that it does depend on the endpoints as well.
I don’t use Mesh setups. Just my 2 router system being hardwired. And my ASUS router having plenty of coverage to supply my whole apartment with WiFi. I did buy a switch recently so now most of my equipment in the living room is Ethernet connected. But watching TV (Internet box from my ISP) or streaming Amazon Prime, HBO Max or YouTube on the TV never had issues when using WiFi. I have just decided to hardwire the place.
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An old friend of mine had a good line
Hire Cars Feel No Pain 
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Way to prove my point
I am not sure that it does prove your point, you are disappointed that Roon does not work for you (and that is a shame), but it does work very well for others. We all have different equipment and budgets, and i hope that we all would wish to support each others enjoyment of listening to music; i took Jim’s comment at face value, being that other alternative platforms might serve you better at this moment in time.
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Ah yes, this. Thank you. Me too, did this. Then did all the other things with the RJ45 thingies. All good now. Sucked before.
EDIT: also, could just use ROCK then you have no choice, you have to use ethernet to connect your core. ROCK disables WiFi with no recourse even though the NUC hardware supports it. Perhaps that tells us something, as a design choice.
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Roon needs a solid, capable network to function properly. A good network setup costs a mere fraction of what a decent hi-fi system costs.
Why skimp on network implementation?
Really good wi-fi systems (with proper wired backhaul) cost a fair chunk of cash. A good wired system is much cheaper (provided you have sensible access to run cables) and will run rings around any wi-fi setup.
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A lot of people don’t know how to get that right, or even how to find someone who does.
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RAAT has been bulletproof for me. It’s a defining feature of roon.
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Well, I have my main Roon Endpoint (Cambridge Audio Asur 851N) Ethernet port connected to my Devolo DLAN Magic 2 EoP which happily finds it’s way to my ROON ROCK on a NUC connected to a swich on a proper wired LAN. I get 1120 Mbit/s from the gateway Devolo DLAN Magic 2 connected to the switch, and 756 Mbit/s in the other direction (which is not really relevant). It has worked perfectly like that for many years ant the highest resolutions I can stream, with NEVER a hiccup. For me it is well proven as a viable option.
Before the Asur 851N was upgraded to full ROON support, it was fed via the same link with a Raspberry Pi running Riopeee, and was equally resilient. EoP can work, just buy the best units available and not the cheapies, and I think you may need good house wiring for best results, as speed throughput varies around the house (rather like WiFi).
EoP may not be guaranteed to work, but it does work well in lots of set-ups.
I never said it could not work but that fact remains it’s not using tcp/ip for transmission between units and it’s sending tons of rf into your mains system. I used powerline for a short time, it was unreliable and sent out rf my phono stage could pick up. It didn’t stay for long. Wireless was far better and perfectly stable for connecting endpoints.
Yes I fully accept these points, but the phrasing is such that perhaps it should never be tried. I do have an active filter on the output the Devolo is connected to, and it suits me in a specific area where I simply cannot run a cable from router to streamer location.
I never get drop outs with RAAT, I listen for hours without issues.
No issues with Chromecast either but I use that mainly with a podcast app to a smart speaker, not Roon
My Kef LS50W2s are connected via ethernet, other than that it is WiFi all the way for me, my Chord Poly/Mojo2, Wimm Pro Plus, a couple of Rasp Pi end points and of course my phone with dongle DACs all work perfectly ok and sound great.