Yes, that is mostly for portable PC games, and lacks what using PSP, PSP Vita, Game Gear, and all others have in convenience, battery, and game library, on games designed on purposed for tiny screens.
Many people talk about the Steam Deck, when in reality it isn't that much of a hit in units sold compared with any portable games console from Nintendo, SEGA, Sony.
Well Switch games aren't really designed for small screens either.
I haven't bought a Steam Deck because I think it's (1) too big (see my sibling comment on console size—to be fair I own a Switch 1 and 2, but the Steam Deck is even bulkier) and (2) too fiddly, this is the thing I've never liked about PC gaming.