My 4K monitor is a fairly early one. It has 2 60Hz ports and 2 30Hz ports. It’s shared between PCs, so my work laptop is relegated to 30 Hz, where it doesn’t really matter. What refresh rate do you really need, just to update the mouse cursor?
But we’ve drifted off topic (yet again).
My current plan is to use my 8K for several years and then get an 8KX, unless something even better comes along. I’ll probably upgrade my GPU at least once, before I buy another VR headset.