One closing option is primarily opinion-based: Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.
I have recently seen a number of question where the OP provides/relays an abusively strong opinion, which sometimes would give a strong bias on the question, and on what we could answer (because comments/answers are likely to address the OP's claims). Sometimes it even seems that the post is mostly a rant and that it finishes with a rhetoric question just to appear as a question.
I'd suggest that the rationale of this primarily opinion-based closing option would be expanded to encompass such cases, even when the question, isolated from such premises, would not qualify.