No, it was per area per economic unit originally, and the definition was changed in ways that don't make a lot of sense. Clearly the performance of a 72-core machine has little relevance to personal computing.

Not commenting on Moore's law, but I don't see how the last part is true when GPU have become a main component of personal computing. They are in fact becoming more and more important with the need for AI inference and always more demanding rendering tasks (both in resolution and frame rate).

The vast majority of software isn't written for the GPU. That's still true today, and it will likely be true in ten years as well. Unless we reach a point where that changes (and most software can fit its restricted paradigm), we should compare apples to apples. If we were talking solely about GPU performance, I would be more inclined to agree with claims about "80x more processing power than 10 years ago" etc, though.

Apple GUI frameworks enable them to rely heavily on the GPU, and the smooth and slick GUI are definitely a big part of their value proposition. While I agree that the business logic of most apps aren't using the GPU for compute, I think most app will have a rendering side where it is important.