Replies can end up in LQA review queues: https://stackoverflow.com/review/low-quality-posts/37037121. I don't think this is as designed since "Not an Answer" is not available from the flagging interface.
Also:
- You can add comments to them from the review queue.
- The comments cannot be seen on the main site, so if somebody replies, you can only see the reply from the review page.
Of course, if this is by design, then I am not 100% sure how I'm supposed to review this. I just selected "Looks OK" as I think it's acceptable to have such a response for an open-ended question.
Found more:
- 10 Nov 25: https://stackoverflow.com/review/low-quality-posts/37040339 and https://stackoverflow.com/review/low-quality-posts/37040720 (found by M--)
- 18 Nov 25: https://stackoverflow.com/review/low-quality-posts/37046111
- 20 Nov 25: https://stackoverflow.com/review/low-quality-posts/37047811 and https://stackoverflow.com/review/low-quality-posts/37047830