OK but then you lose the benefit of all future upstream changes and now you have to manage constant rebasing
Engaging the community and intelligently advocating for improvements is a way to contribute to projects as well, especially if you're willing to use a disposable forks to explore the design space, put forth RFCs, PRs, etc.
Oh the horror of having to do some rebasing in a world where LLMs do all the hard work for you anyway. And at an AI company with unlimited access to compute resources no less.