Well "move fast, break things" is fine in certain contexts... SpaceX could be said to have done that. Their first few launches exploded. But they put in the engineering discipline, extensively tested all new/innovative processes, and they didn't dare put a human or even a paying payload on top of their rocket until they'd done extensive work on the test stand and actual launches.

You can move fast and innovate in life-critical systems so long as you prioritize the engineering and testing.