The models make your personality a stronger version of itself.
This is most harmful for people already subtly prone to psychosis.
But it's a broader phenomenon.
The agents "Yes, and" whatever you say.
They have no interiority, no skin in the game to force them to define and defend a boundary of push back, like all real humans have.
Calling it sycophancy makes it sound like it's only when it's turned up to 11 that it matters.
But it has a consistent asymmetry even at less noticeable levels.
We're not used to all of our interactions with human-like intelligences by default validating whatever we've said.