This may surprise you, but because of ray tracing, being CPU limited is much more prevalent now than it has ever been. That HWUB graph has already been heavily critiqued because they never tested any CPU bound scenarios, which is why the graph looks as bunched up as it does.
If you're GPU limited, then the CPU hardly matters at all. To do proper CPU testing, reviewers need to find the most CPU limited areas in the games and also enable settings like ray tracing which increase CPU dependency. Compare the HWUB graph to something like what PCGH.de does with their testing.
This is a worst case scenario for Zen 4, because The Witcher 3 Next Gen has terrible CPU optimization which makes it hammer 2 cores (due to non native DX12), and when you factor in the BVH calculations from ray tracing and the increased crowd density and draw distances from the next gen enhancements, then it's literally the perfect storm for CPU testing.
Here the 13900K is a good 40% faster than the 7950x at 720p to maximize CPU dependency. Currently, no CPU can maintain 60 FPS in this title at all times and even at 4K you can be CPU bottlenecked.