Maybe it sounds a bit like a conspiracy theory but with how often people make this “mistake” i really believe it’s a deliberate effort to undermine the meaning of open-source

I am only messing with KVM/libvirt for fun so i have no professional experience in this but wouldn’t you want to use virtio disks for best performance?

I don’t have a solution just another experience: i have a Acer Xb270hu that i never got to work 100% . without edid tweaks it would only show a tiny picture and with the tweaks it only ever got to 120 hz. Now i have a Alienware AW2725DF and it works at 360hz out if the box no issues