Aside from iPods, which they have wisely cannibalized themselves with the iPhone, Apple still sells all those items, with headphones a Fortune 500 company all on its own.

It's not that Apple changed its menu, it expanded it.

Apple brought the sensibilities that made their computers interesting to other consumer electronics. Facebook seems to be doing the opposite and trying to mimic whatever's popular. The only "Facebook" sensibility they ever bring to the table seems to be figuring out ways to over-optimize and over-monetize until the golden-egg-laying-goose dies.

More like MTV non longer showing music videos imo. Facebook could have stayed your personal Rolodex and serve that use case but decided to chase engagement wherever it could.

Maybe it was inevitable and necessary to avoid death or maybe they abandoned their primary purpose and turned off their users and therefore the network / social graph from which they derived value.

Or maybe they will continue to print money.

That did happen! MTV was showing more 'reality shows' and such for a while as they were more successful. Then you had MTV2 and MTV3 showing actual music videos.

What killed MTV was youtube around 2007-2008, not another tv channel, but a completely different tech.

The change for Apple was a slow boiling pot. And initially you couldn’t even set up an iPhone without a computer (with Mac OS integration making it a lot smoother).