Ronny maybe you should read some other threads before posting as you will see that @danny has already said that they are testing the M1 native version of Roon.
Roon will never really be a truly native app as it runs on top of DotNet and that has not that long (in the scheme of things) been migrated to M1 native Mac’s. Everyone that bought an M1 Mac before that was only going to get emulation, even if that is very good.
Other than that yes it will make an excellent Roon server, but it’s not like Rock in that never needs to be touched as it has Apple updates, which have broken multiple of my MacBooks in the past (I had to recover my late 2015 MacBook Pro after the last major upgrade and my 2020 Air was made useless by an upgrade and had to be wiped, along with several of my colleagues).
Nucleus is for users that want an appliance and do not want to tinker with a computer ever, from the moment they turn it on and plug in the Ethernet cable. Can a tech savvy friend do this for you, yes, so Nucleus is not really for people like us, but it still has a place.
In a year or two I might well swap my my nicely working Intel NUC 10 (cheaper than a Mac mini) running Rock for an M2 Mac so it can also run HQPlayer as well on the same machine. I think it will be amazing when it is fully working and released and debugged.