How is that not a valid metric for choosing a phone? The way I see it, it's not really any different to choosing a phone for its camera performance or battery life.
I bought the new iPhone 4 for that Infinity Blade sequel on iOS.
Imo that was peak gaming on mobile devices and I'm sad we failed as a society to move into that reality and instead into one where we match fruit and spent $10k to do so.
There are good mobile games too, and emulation. I have a decent laptop to play games on and I still prefer my phone for gacha titles everyday over Android emulation on PC.