That's a fair perspective, but most people strive for as few clicks between users and their targets as possible. Forcing a user to become semi-tech-competent by sending them on a fetch quest to figure out their os, while not an inherently bad thing, does work against this overall goal....

Idk, it's like education vs service industry goal setting, that's all I'm trying to get at here lol

Edit: plus, there's no guarantee that it will remain just the big 3 for forever. There was a time before Linux, maybe we'll see a time after windows.... Unlikely, but one can dream lol