Is this the right place to find help building a PC for MFS2020?

Perhaps in MSFS, but I know people who play Il-2 and driver issues are a constant. It might happen to less known games as well. Back then I worked with some video editing freeware and it was a pain to set all the hardware. Once I migrated to Nvidia, I never had to do any workaround to use my software.

Then I would never buy a Radeon card. Perhaps who works with dedicated software or mainstream games have no issue. I did, a lot. And at least with the Il-2 branch people advise to only buy Nvidia.