Move fast and break things was the Facebook motto. I've never really felt it was a Google embraced concept. What Google's values have always lied with investing heavily on testing to ensure folks can be productive by knowing that if they would break something a test would catch it.

That said it's good to make sure you're building for requirements that exist. Engineers have a habit of inventing requirements and causing delays unnecessarily. Building something and placing it in the hands of users so they can give you feedback which you can react to is far more valuable than building products in a bubble.