Startup people tend to neglect complexity and repeatedly underestimate the harm which comes as a result of 'cutting corners'. The hilarious thing is that once in a millennia, a hot startup like Facebook comes along and grows at such an incredible rate, that they can basically get away with cutting all corners... Proving the exception, not the rule; most startups who try this same approach invariably go out of business because it turns out that technical debt is actually very expensive; not every company can afford throwing hundreds of highly paid engineers at the problem of refactoring a code base over and over... Not every startup can afford to rewrite an entire PHP engine from scratch to achieve a modest speedup.
But the thing which is funny about this is that a startup like Facebook/Meta attracts so much attention that everyone is clamoring for their advice... Literally, everyone wants to take advice about reality from a company whose experience of reality is unlike that of any other company which has ever existed or will ever exist in the foreseeable future... I do believe that the average entrepreneur has more to learn about startups and software development from a bum on the streets of San Francisco than from a tech exec.