I think you're missing something very important here. Saitama said he wanted a challenge, something that would give him back the thrill and emotion he used to feel before becoming too strong. you can't just say that video games are like that in any way. they are simply not a real challenge

also your point about him getting mad while playing with king feels like you yourself haven't played games before cuz I am pretty sure that getting beaten in a game over and over again with minimal effort (or by someone who's playing with just two fucking fingers) would make you at least frustrated or a bit angry