Based on my searches, I could only find 3* controllers that have this feature (and interestingly, they all do it differently). There’s the new 8BitDo Pro 3, where the face buttons are magnetic, the GameSir Supernova, where you have to remove the faceplate to swap the buttons, and the GameSir Tarantula Pro/T3 Pro, where there’s a motor that swaps the ABXY layout.
This seems like a pretty simple feature that would be really useful for multiplatform controllers. Lots of controllers advertise that they work with PC, Xbox, Switch, Android, etc., but very few of them give you the option to physically swap the ABXY layout. They usually have one layout or the other. I would get not having these features on a really budget controller, but there are some controllers that are really expensive and don’t have this neat little button swap thing (instead opting for gimmicky things like a screen)
edit: * There’s actually 4**, I forgot about the Nyxi Flexi!
edit 2: ** Nope, it’s five***, the Gulikit KK3 Max has replaceable button caps! Very cool!
edit 3: *** Actually, the older KK2 Pro also seems to have this feature too, as well as a few other older Gulikit controllers, so I guess it’s >6? That’s cool. With four different companies (GuliKit, 8BitDo, GameSir, and Nyxi) offering at least one controller with this feature, I guess it’s not as rare as I thought. Who knew?
I think I’ve seen software swaps for the actual presses in most situations where I’d want to.
I think the only time I consider doing something is when I’m playing a Nintendo game on non Nintendo hardware, so my MiSTer or on retroarch and both support swapping Nintendo to western style. If I’m holding a Nintendo controller, muscle memory makes it not really a problem for me at least
If you mean the actual physical buttons, I’d just say blank buttons are better than labelled ones in general, most popular controllers have blank mods that are pretty easy to do if you have a screwdriver with the appropriate bit.