Equating LLMs to humans is pretty damn.. stupid. It's not even close (otherwise how come all the litany of office jobs that require far less reasoning than software development are not replaced?).
Doing so has low risk, the senior devs may perhaps get fed up and quit, and the company might be a laughing stock on public PRs. But the potential value for is huge.
Not saying that LLMs are useless, but that's a false equivalency. Sure, my auto complete is also working 0-24, but I would rather visit my actual doctor who is only available in a very limited time frame.