When I was younger I asked a friend who was a mechanic why the engines got such rotten mileage. I said my grandmother had an old 2-door Chevy that got great mileage, ran great. and never broke down. He thought a minute and said, "Well, that was a sweet engine and it would still run a car great. Or, it would run the radio, heater, air conditioner, electric windows, electric seats...." "I get it."
Perhaps an element of the same is happening with phones. Also, measuring phone size by screen size is misleading because phones used to have bezels and a few still do.
Me? I don't play games on my phone, do no social media, and since I'm deaf I don't take phone calls. My phone automatically quits charging at 80% but it will charge from 50% to 80% in an amazingly short time.