Look at John Romero, he knocked it out of the park with Doom 1, 2 and some of Quake, but all his projects after have been flops of catastrophic proportions. Look at Jonny Ive's last design mistakes at Apple compared to the early successes that were perfection from all aspects.
Most people can't pull success after success forever, they always bottom out at some point then decline, some sooner than others, especially in a fast changing field like tech. So it's a high chance those senior higher ups at Apple are now dated and out of touch, but still have the high egos and influence from the bygone era. Happens at virtually 100% of the companies.
I don't think that characterization is quite right either. I'm a big fan of Brian Eno's "scenius" phrasing:
> A few years ago I came up with a new word. I was fed up with the old art-history idea of genius - the notion that gifted individuals turn up out of nowhere and light the way for all the rest of us dummies to follow. I became (and still am) more and more convinced that the important changes in cultural history were actually the product of very large numbers of people and circumstances conspiring to make something new. I call this ‘scenius’ - it means ‘the intelligence and intuition of a whole cultural scene’.
Extremely successful people benefit from the scenius within which they get to operate. But as that context changes and evolves over time, they fail to recreate their earlier wild successes - not because they lost any of their skills (although that can also happen), but because the skills aren't sufficient, and the deep, layered conditions that enabled those wild successes just aren't there anymore.
Look at the Solvay Conference. That's a lot of lightning in a bottle all at once.
Though it's beyond me to articulate it, perhaps that was also cultural.
And the other guys from id haven't exactly recaptured the same magic either. It's a shame they broke up, it turns out that the team was way stronger together than any of them has been on their own.