Agree that it does make the product better, though if they put their RAM chips soldered on the board instead of in package, it would allow repair or upgrade without sacrificing the whole CPU unit.

GPUs do not put their RAM in the same package as the processor itself, and it does not sacrifice a significant amount of performance.

The M-series processors' primary benefit by a huge margin is its architecture that allows a higher memory bandwidth than say SODIMMs and that benefit is independent of the choice to put the RAM in the package.