Its sad but linux is still a second class citizen. Nvidea drivers have improved greatly over the years, but it can be still flaky especially newer ones.
Multi moniter support too, it has a history troubled with challenges. Its much much better than it used to be but sometimes there are setups and usecases which have problems. It used to be multiple monitors, just having them as a desktop, was impossible. Nowaday I can daily drive Linux and expect to have a good desktop experience across multiple monitors.
Mindyou, every windows update its a dieroll what breaks for my work surface labtop. Often my display or dock behaviour breaks or my bluetooth, or my networking. Not to excuse the bugs in linux, but to show that even MS on their own hardware have bugs like that. Pcs are hard and even MS can’t do it flawlessly.
What you describe as simple multimonitor RDP might actually be a very complex task from a technology and display standpoint.
That being said, it totally sucks having a usecase and finding out that for you have problems getting there. I agree that Linux still has major hurdles for general adoption, (although again, it is so much better than it used to be). Look at it this way: if desktop linux had the same amount of money and development time thrown at it as Windows or MacOS, we’d have a very different experience.
As for tips. I recommend to dualboot. Use MS for your usecases that are not a good experience and use Linux for the other things. Keep checking in with the multiple RDP tech/workflow to see if it works. I did the same thing for years. The only reason I used windows was my games. For other things I used Linux and learned my way around the desktop while doing that. Eventually Proton came along and I could switch entirely.