I’ve been a CPA for a decade and don’t use a numpad, though I have to give credit to World of Warcraft for my ability to hit any number with ease. I’ve found you will be most efficient when you never have to leave home row with either hand, so learning to use a trackpoint also helps.
Yes and no, I couldn’t get stable frame rates on ps3 and it wasn’t enjoyable. Like my steam deck but it’s not the “end all be all”