> The best phone APUs nowadays are more powerful than my not so old MacBook Air M1.
Which is, itself, an APU.
The question is, is it better than a 2020 era dGPU and CPU combo (at any thermal/power envelope).
The answer is complicated unfortunately, but a 3090 (a 5 year old card) has 4x the memory bandwidth of an M4 Pro and also about 4x the FP32 performance.
So on the high end, descrete graphics cards are still going to be king for gaming. (I know that a 3090 isn't common, but 5080s are more powerful than 3090s).