No problem, english isn’t my native language either.
In the end, it just boils down to: are you okay with a downtime while reinstalling the hypervisor and restoring from backups? If yes, you don’t need a RAID. If no, a RAID of some kind would probably be the most sensible choice.
I have been using Arch Linux on my Desktop PC at home since somewhere in the last quarter of 2020. I didn’t have to rescue-boot or anything like that in all those years. I did reinstall Arch once because I got a new PC.
I do have an all AMD setup, as I heard NVIDIA isn’t all too nice to linux in general and the drivers were a hassle to get right, never tried it though.
Maybe it depends on what you’re doing on your PC. I’m mostly gaming, surfing the web, youtube and a little docker on the side.