I use a 7600x CPU (while waiting for next gen) and at 4k it's been wonderful. Clocks to 5.4 ghz. Never been limited by having 6 cores. According to Tech Power Up doing so only loses 10%, performance max. Not worth paying hundreds more IMO.
You find that running a 4090 on a 7600 "wonderful"? It's a huge bottleneck at 4k with RT, I posted proof of my experience in the post you quoted. Also "hundreds" more is not correct, you can get a 7700 for £60 more, which would be infinitely better.
I guess I should look at it another way. There's someone out there putting part worn tyres on a Ferrari. Someone using a black & white TV and calling it "wonderful". Who am I to judge such wisdom?