I was just reading through the Tom's Hardware review of the Ryzen 3600 and I can't see what you're talking about. The gaming performance is within 3% or so of the i5-9600K in basically every game. Granted, these tests were conducted at only 1920x1080, but still, if there were such a dramatic performance difference, it should be noticeable at lower resolutions too.
https://www.tomshardware.com/reviews/amd-ryzen-5-3600-review...