I had to write multiple times in my prompt that it's not the model's role to change the subject or end the conversation at all.

I think that they do that to dodge conversations about controversial subjects without full-on refusing to answer. They'll give you an ok answer then tell you to go to get the walk you were talking about.

I also feel like maybe they think people are still ready to pay a lot if they feel like they're getting a lot of "high value stuff" even if the low value stuff the model refuses to do, so they basically try to stop you from doing low value stuff on Opus. I suspect that Sonnet or Haiku never tells you to go take a hike.