Yea oled is very nice, it's what most phones today have too. (Mine included)
It is nice to have a portable computer, but op is asking for playing games and your games can have wayy better graphics if you stream it from a full gaming pc vs compromising quality to have it run on the steamdeck. When you're just running games on steam there's not that much more difference between the two.
This is great since
[AOT spoilers]
That's actually what happens to Grisha's sister