Well most of these AAA ports aren't exactly new and people interested in AAA gaming likely already have something like a PC, gaming console or Steam Deck, which are all better suited to these types of games, because they have more power than a mobile device and/or built-in controllers.
Like, what is the setup for playing at home? Mirror an iPad to an Apple TV via AirPlay to play on your TV with a Bluetooth controller?
And on the go, you either need a bluetooth controller and a way to hold your iPhone while holding the controller, or get one of these clip-on controllers.
Then there's pricing, with the games often being a lot cheaper at least on Steam.