Too late to fix now but I wish the button labeling on the SNES was rotated 90˚ clockwise.
On NES, A was for acrobatics and B for brawn or battling or bullet speed. Usually jumping with A.
On SNES they kept the classic NES grip except the labeling was garbled so Y was “the B” and B was “the A”. And the A was now specials like the weird twisty jump in Mario. Instead of being the most basic button it was relegated to being a weirdo button.
Made infamous in Super Mario All Stars where X or Y was “the B” and A or B was “the A”.
So far no good but then on Virtual Console they made it even more confusing because now the A was the A again and B was B. And it was unremappable. But they did a smart thing: they made X also be an alternate “B”, so you could have the literal A=A and B=B (like Ditko intended) or you could have the NES grip with A=A and X=”B”. A perfect compromise solution to a problem that never shoulda happen in the first place if they had been three percent more sober when making SNES.
But then on Super Mario Bros. Wonder they brought back the problem and returned to the All-Stars layout. And you can’t even set controls indivudually on multiplayer—everyone needs the same layout.