>but it’s also incredibly easy to learn how to do things the wrong way, if you have no one to learn from

Yep, say hello to startups who go cheap by outsourcing to developers who are not as good in their craft or don't care about learning more.

These startups also don't stay in business for very long ;)

I guess I might phrase it something like, if you're going to make L5 it is probably the result of excessive competence. If that is you, you will get their faster cutting your teeth in at least a few different startups. Develop judgement and a variety of experiences.