How do you gel the 'move fast and break things' ethos with an internship / mentorship role? The former requires existing domain knowledge to hit the ground runn

How do you gel the 'move fast and break things' ethos with an internship / mentorship role? The former requires existing domain knowledge to hit the ground running and achieve large things quickly, whereas the latter requires going more slowly, explaining the reasoning behind decisions, allowing mistakes as learning processes, etc. edit: Unless you mean established former YC companies who are no longer in the startup mindset. I didn't consider that originally but then why limit yourself to YC companies if you can snag some sort of vetted supply to the Facebooks/Twitters/etc. of the world?