Hey, that's simply not true this generation. Have a look at https://www.computerbase.de/2020-11/amd-radeon-rx-6800-xt-te..., https://www.computerbase.de/2020-11/amd-radeon-rx-6800-xt-te... shows individual gaming results. AMD does not reach higher FPS on lower resolutions, so they are not a better fit for 240Hz gaming.

Which does not mean that the cards are bad or worse! They are just not better in that category than in other categories, like 4K gaming.