Yea, it shouldn't. However many PMs I've worked with over the last decade seem to think that development is the slowest part of the process -- that requirements

Yea, it shouldn't. However many PMs I've worked with over the last decade seem to think that development is the slowest part of the process -- that requirements need to be completely understood and designs completely buttoned up -- before major software work begins, because of this misconception that it's a slow and risky process. Now there's even less evidence to back up that misconception since GenAI can be writing the code in parallel to all the communication.