SNES platformers ran at 60 fps in almost every game, and definitely every Mario game, SM64 was the sole exception. SMO was also 60 fps.

There is no category of games that would not improve in playability from 30 to 60 fps.

Not trying to be argumentative here. As mentioned upthread, I own 2 Switch consoles and the difference between 30 and 60 fps when running the same or similar games are stark. Perhaps i'm more sensitive than others.