Comment by rwmj

Another difference if your junior will, over time, learn, and you'll also get a sense of whether you can trust them. If after a while they aren't learning and you can't trust them, you get rid of them. GenAI doesn't gain knowledge in the same way, and you're always going to have the same level of trust in it (which in my experience is limited).

Also if my junior argued back and was wrong repeatedly, that's be bad. Lucky that has never happened with AIs ...