Nothing beats / changes the recommendation for a wired network connection for your Roon Server. Newer WiFi standards mainly offer more bandwidth / throughput under optimal circumstances.
If you connect devices with older standards to your new WiFi cell, these possible gains are forfeit (or to put in other words, nothing to gain for clients stuck with old standards). If your old Access Point was the main bottleneck though, you may still see some overall improvement. For client devices that are stuck with built-in WiFi modules of old standards that also feature wire connectors, you can buy WiFi devices that support client mode (WiFi Bridge) and a current WiFi standard. Then wire those to the WiFi Bridge so these use the modern standard too. This also helps to reduce the total amount of individual WiFi clients which may also help to improve your WiFi experience.
I’m currently using MikroTik hAP ax² as WiFi bridges against a MikroTik hAP ax³. These are very flexible devices that allow the user to program how they work. If this is not what you’re looking for, then please buy devices that offer the needed modes and features of the shelf. Depending on your needs, this may require you to read product manuals and research stuff on the internet before you make a buying decision.
Note: It may be helpful if you could figure out the cause of your current issues with Roon first before you proceed with your proposed fixing measure. Different root causes may require different/additional measures to fix.
PS: I think WiFi 7 is still very much for early-adopters. You might be hard pressed to find any WiFi 7 supporting client devices currently and by the time WiFi 7 reaches main-stream, more and newer generation WiFi 7 network infrastructure devices (Access Points, WiFi Bridges, Range Extenders) may be available.