im amused that people are still relying on third party for handling auth when you can roll your own now with LLMs

It's not third party, it's a library you use and you store the data. Got tired of it? Write your own, the data is there.

It's one of those things you shouldn't trust LLMs to such an extent; that part should be very solid because the consequences of bad practices are getting to front page of hacker news :)