For a very long time, i only game with an XBOX controller. I think since the mid 00s or so. My last console was the XBOX 360 and after that i focused on PC, with XBOX controllers. I also played a lot of Playstation stuff during those years but not much Nintendo stuff. The last Nintendo console i bought was the Wii and that didn't have a traditional controller anyway.
So, the bottom "A" or "X" button is always my jump/action/enter/make selection button. Basically, the "main" button. It's been like this for for me 20+ years. Even on the Gamecube which has a different placement, the main button is bigger in size than the rest so it's hard to miss and also on the N64, the "main" button is the bottom one just like on PS/XBOX controllers. I can't comment on the SNES because its been a million years since i played on a real console. But i still play on Gamecube/N64 with no issues.
Recently i had the chance to play on a Switch i borrowed and it was.... an interesting experience. Even after many hours of play i still couldn't get used to the reverse button prompts and placement. I would still press the wrong buttons all the time. I simply can't re-wire my brain after so many years this function is etched in my brain. But even if i could, then i would still have to re-re-wire every time i want to play something on a different system. And sure, you can change the controls on PC games but not on every XBOX/PS game.
That basically means i'm literally locked out of Nintendo consoles. The only viable solution is emulation, since you can change everything as you like it and there are even mods that change the on screen prompts for XBOX or PS controllers. But outside that, how do you guys manage? Can you jump from one standard to the other without issues? Is my brain limited so it's just me?
If you have a functional brain you should be able to remember at least 3 button mappings... I mean how do you type on a keyboard, you keep watching it again and again because there're more than 150 keys ?
I never understood people having problems like that. If you rarely play a system, let's say Nintendo systems like here, I can understand that you might need 10 to 20 minutes to adapt. But if you can't... The problem is you.
Just for information that binding isn't a nonsense, and it's the Xbox biding that is reversed. In Japan they read books from the right to the left, so for them it makes a lot of sense to have A and the right and B on the left, same for X and Y.
Oh also on PlayStation consoles in Japan O is to validate like "OK = O", and X is like "nope, cancel, go back", it is just that in Europe we changed it to X = OK (which is quite fucked up) and O is cancel (wtf?). Bonus the triangle button should have been to control / change the viewing angle / camera, and the square button was supposed to evoke a book and then to bring you into the menu/manual/documentation part of the game.
But don't worry you're not alone and this is why many gamers won't switch from Nintendo to Xbox to PlayStation or vice versa, because they're too used to their bindings, but at least usually people can play if they take 20 minutes to get used to the new binding.