Having worked at early stage startups and mid sized companies there's already a 10-20x productivity gap between them due to this (even on brand new projects at large companies vs startups, where it's not an issue of legacy code).
As an example I just witnessed a large co hire a consulting company to help them "ideate" on a RAG app that barely worked and required 3 rewrites and ~18 months to make it to POC stage, even though a front end dev had a better working POC that he hacked together in a day and a half.
I've heard way worse horror stories from friends at Google / Meta / Apple.
What will happen when tiny startups of 3-8 people get 5-20x more productive and can ship new stuff daily?