I wasn't talking about confirm/cancel. I meant the main controls that don't change between regions. The bottom button (X, A or B depending on console) is almost always accelerate, jump, etc. The weird thing about modern Nintendo games is how they map actions based on letters rather than position. Like, the N64 controller had B as the left button and A as the bottom button, so it should map as Y and B on the 3DS, with left and down C buttons as X and A. It's just oddly inconsistency with older Nintendo games and other game consoles.
It's a non-issue, only slightly annoying because using the button closest to the edge of any portable system can be awkward to press (in the way that I hold it). Just a weird observation. I have dumber observations, like how Sony's perfect diamond button layout (and Nintendo, Sega and Microsoft copying it) ruined Nintendo's shorter and wider four button layout. Or how the first and only Nintendo controller with six buttons had no Street Fighter game to take advantage of it. Getting autistic up in here.