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.
So I am curious, how do people get these lazy outputs?
Is it by having one of those custom system prompts that basically tells the model to be disrespectful?
Or is it free tier?
Cheap plans?
In both cases the fix is really simple, just compact.