There's two sides to this argument and you appear to have missed the important half. Anyone can slap a better GPU on and get better framerates. Not just anyon

There's two sides to this argument and you appear to have missed the important half. Anyone can slap a better GPU on and get better framerates. Not just anyone can slap on "the next GPU up" and still beat you in battery life. Everything I've ever read about Apple's supposed optimizations is that they have to do with power efficiency.