Once the CPU gets to the level of performance meaning it can run the game you want at 100% speed without throttling, there's no real advantage to it being any faster. Certainly at desktop-level TDPs, the ryzen CPUs have already reached this point for the vast majority of titles (and those titles that it can't are likely using difficult to emulate features so that an intel CPU would likley struggle too, even if it has a ~20% advantage over the ryzen).
For GPUs, however, once you can get to the level of performance so it can run the game at the defaults with 100% speed, you can use the extra headroom to increase the IR, tweak various 'enhancement' settings, enable MSAA etc.
So there's an inflection point where the GPU starts being more beneficial to focus on than the CPU, hence the interest in the more powerful GPUs from AMD as integrated graphics units.
For GPUs, however, once you can get to the level of performance so it can run the game at the defaults with 100% speed, you can use the extra headroom to increase the IR, tweak various 'enhancement' settings, enable MSAA etc.
So there's an inflection point where the GPU starts being more beneficial to focus on than the CPU, hence the interest in the more powerful GPUs from AMD as integrated graphics units.