My reaction is more to the broader tone of some of these discussions. In my experience engineering cultures can become quite dogmatic or obstructive, and that can block improvements just as much as the opposite problem.
At our definitely-non-Meta-scale, we’ve been experimenting with letting more of the team get their own PRs up with LLM help. Overall it’s been pretty transformative. Interestingly, people tend to work on QoL and polish improvements that many SWE workflows often don’t prioritise or have time for.
There are outliers of course, but we learn, revert, and move on. If the outcome somewhere like Meta is PMs building nonsense, that feels more like a deeper systemic issue than something inherent to opening up the codebase.