This answer to another question of mine is the context for this question.

I have more than once, had the Post Your Answer button just move my answer to a question comment for me. But only if it meets or fails to cross some unspecified threshold. (Don't do that. Note that that is not encouraged)

Can we remove auto-conversion of sloppy answers to question comments?

This is a feature request concerning the automatic website conversion of a terse answer to a comment attached to the question. Let's stop that from automatically triggering. Specifically, because I think it has a detrimental side-effect.

IMO, this will help curtail (instead of actively encouraging) sloppy answers.