Are you trying to say that it is reasonable to expect people to do a fresh OS upgrade just for upgrading a GPU? that's insane.
No but it's reasonable for you to try some simple things to get it working, it's rather simple to run windows from any spare SSD or hard drive for testing, or bootable linux from a USB drive and see how things work
There's always alternatives, but a bad attitude and refusal to try anything won't solve problems
Trying another OS is a valid step because people run all sorts of dumb tweaks and fixes to their OS that it doesnt need and it breaks things, I dont even recommend people use driver cleaners as they're a last resort not the first one - they CAUSE problems more than they fix them, yet stubborn people never learn and run in a damn loop.
I've got two different AMD drivers and an Nvidia driver in my VR PC as i swap GPUs in and out of it, and it's got zero issues - yet people tell you to run driver cleaner for swapping a monitor
The 7900XTX has three displayports (One with a USB-C connector) and one HDMI 2.1
At least 3 of the four should work together at any given time, but you'd need to try one monitor at a time with one cable and find out what's going on.
No one else is going to have your exact monitor setup, so spend that time and try that HDMI Cable and get it working on a single display, and then add DP monitors one at time until an issue occurs and proceed from there