Moving fast means more contact with reality, which means faster learning. You don’t get to spend time on things that don’t matter - there isn’t time to spend.
But fast isn’t a universal setting. Some work benefits from slow, deliberate steps - research, strategy, calls that are hard to reverse. There, speed is a liability.
The trick is knowing which mode you’re in and matching the pace to the work. A hare against a deadline. A tortoise against a decision.