Games made with a controller in mind are miserable experiences on a touchscreen. Phones are awkward and uncomfortable to hold like a controller, the lack of physical buttons provides no tactile feedback on where to press, the lack of shoulder buttons means overloading your thumbs with even more inputs, and your fingers obscure half the screen.

And if the implication is that they'll port those iOS games to Mac, then I wouldn't count on it if it takes even a single iota of extra effort on their end. There are more Linux gamers than Mac gamers, and yet game devs still can't be arsed to test their games on Steam Deck.