But they don't retain anything from your on-the-job training. The next model iteration is yet another junior fresh out of college, and knows nothing about the painful training procedures its predecessor put you through.
Nothing prevents an LLM agent from writing a bunch of "notes to self" and using that. And the next model from picking those notes up and using them. Coding agents already do some of that natively.
Hell, we might eventually get an LLM to say "wow the old AI was an incompetent idiot" after reviewing all the notes and session logs. That's how we know we reached human parity!
Yes... but the next session with the same model is yet another junior fresh out of college that knows nothing about the painful lessons the last session put you through ten minutes ago, either.