It's worth noting that one big advantage SpaceX has over other rocket makers is that SpaceX gets to inspect landed first stages. That makes their rocket develop

It's worth noting that one big advantage SpaceX has over other rocket makers is that SpaceX gets to inspect landed first stages. That makes their rocket development closer to airplane development than everyone else's rocket development, and no, it doesn't have to be perfect before it is tested. It just has to be good enough to land.