Sometimes having a lot of experience, is a negative for dealing with new things.

The problem is that one's past success leads to ego. Ego makes it hard to accept the evidence of your mistakes. This creates cognitive dissonance, limiting contrary feedback. The result is that you become very sure of everything that you think, and are resistant to feedback.

This kind of works out so long as things remain the same. After all one's past success is based on a set of real skills that you developed. And those skills continue to serve you well.

But when faced with something new, LLMs in this case, past skills don't apply. However your overconfidence remains. This makes it easy to confidently march off of a cliff that everyone else could see.