Maybe. I, uh, would be a little nonplussed if HL3 was announced a mobile game. I'd even go so far as to say that I'd be miffed.

"Do you guys not have phones?"

Highly unlikely. Because the Steam Deck is not a mobile gaming device in the classical sense. And they definitely want to make HL3 accessible to regular PCs as well.

I think "mobile" and "handheld" are pretty distinct categories at this point. Switch games a pretty qualitatively different than most of the junk in the android app store.