Also, their eagerness to produce. A good employee (senior or not!), knows when they're at the end of their wits and say so. In areas where LLMs are knowledgeable, but not knowledgeable enough, they'll still produce. They're stuck at unconscious incompetence, kind of like a systematic Dunning-Kruger effect. To solve that, we can either increase competence (moving out the area where this effect is noticeable), or maybe introduce some kind of feedback, self reflection (one could say, some kind of conciousness [0]).

[0] inspired by "Goedel, Escher, Bach"

That doesn’t mean they are unpredictably bad, it means assuming that they behave like humans is a bad way of predicting their behaviour. “Unlike humans” and “unpredictable” are not the same thing. If you spend time working with them, you get a better sense of what they are good and bad at and get better at predicting their behaviour.