Move fast and break things has always been more marketing than real ethos. It's an obviously obtuse thing to say to signal people you're an asshole savant (whilst writing mediocre php in your bedroom). I don't know why people bother with it so much.

People act as if because "Move fast" is a good thing, it has anything to do with "Break things". Does everyone at facebook sprint around the office and break limbs when they bump into each other around a blind corner? No, because they're not morons.