There are controllers that integrate your phone and using your phone makes financial sense and reduces the hassle of having to carry a separate device.
Personally I'd rather be able to game on my beefy iPhone 15 with a clip-on gamepad than have to lug around a slow, loud, gigantic Steam Deck or a laughably primitive Switch
> Yeah, there's not much point bothering if you're limited to a touchscreen
Mmhm, I used to have a PDA [1] which had four hardware buttons below the screen and a D-pad, and that was rather nifty for that kind of games.
[1] Asus MyPal A620 – it came as part of a car navigation system which was gifted to us by some relatives. We never used the navigation part much, but because the whole thing was based on a regular Windows Mobile PDA which could run any software available, I appropriated it for myself :-)