To be fair, a lot of the on call people being pulled in at 3am before LLMs existed didn't understand the systems they were supporting very well, either. This will definitely make it worse, though.

I think part of charting a safe career path now involves evaluating how strong any given org's culture of understanding the code and stack is. I definitely do not ever want to be in a position again where no one in the whole place knows how something works while the higher-ups are having a meltdown because something critical broke.