How is incremental development and testing related to human-rated flight?

As is, your comment has a bold claim backed by seemingly unrelated fact.

My comment was in reply to the parent comment saying "Starship is, essentially, Space Shuttle done right" , and my claim is that this is not the case, that comparing Starship to the Space Shuttle is a category error, in that I don't see Starship actually being replacement for the Shuttle as a human-transport vehicle, and thus it cannot be considered 'Space Shuttle done right'.