hmm i always figured people with small hands had it easier than people like me with fat fingers
it's not about muscle memory, but more about ergonomics and finding specific keys faster because of texture/height/etc
I could never dream of typing with them like that, but for twitch gaming every little thing helps imo
Never used a game pad either, but I could see it being pretty comfortable when you are sitting for long hours playing and only need to press a few specific keys (fps gaming or raiding)