CEOs are paid to promote their company, yes, but that doesn't mean they must fake it. The other alternative is to actually believe what they're saying. I don't think Zuck does.

OK, then whose job is it to make important decisions and to define (and explain) the company's strategy? Is that also the CEO?

Felt like the best example of a true believer. I'd say a similar, but less clear version, would be Dario Amodei vs Sam Altman. I don't agree with either, but Dario comes across as a true believer who would be doing AI regardless of the current trends, whereas Sam comes across as a chancer who would be doing cryptocurrencies if that was still big, or social media if that was still the next big thing, evidenced by the fact that he did both of those but they didn't stick so he moved his focus on.

Jobs would have been doing consumer computing hardware whatever happened. Apple in the early days wasn't the success it is now, he was fired and went and started another company in the same space (NeXT).

Any decade now.