One of the times I worked with code written by juniors, the entire FAQ was Bob Ross quotes. The rest of the app was in German, and had nothing to do with painting. It also crashed a lot. LLMs, while mediocre, are better than that.

One of the times I worked with someone with a decade or so of experience, their attempt at writing a solution to convert an old file format (loading time: milliseconds) to a database (loading time: milliseconds) would take 20 minutes on some inputs, and he insisted this was the best it could possibly be. In the same day as the standup in which he said this, I'd gotten it down to the milliseconds that was obviously possible.

And there's a reason I linked to those specific Wikipedia articles. There's world leaders whom you can absolutely trust 100% to get stuff wrong on a regular basis, and even Nobel prize winners are not immune to being confidently wrong.