From EL&U Helpcenter about asking:
Some subjective questions are allowed, but “subjective” does not mean “anything goes”. All subjective questions are expected to be constructive. What does that mean? Constructive subjective questions:
- inspire answers that explain “why” and “how”
- tend to have long, not short, answers
- have a constructive, fair, and impartial tone
- invite sharing experiences over opinions
- insist that opinion be backed up with facts and references
- are more than just mindless social fun
For more detail, read about our guidelines for great subjective questions and blog post about how real questions have answers.
So what are some examples of constructive subjective questions that are allowed on EL&U? (or What are some examples of great subjective questions on EL&U?)
This question and answers would be a great reference.
Note: It can be same as great primarily-opinion based questions also (which are exceptionally good and previously allowed)
Note2: The below meta post is related also and there are some general examples in it:
A look at question quality
Subnote: I could not be sure if this question is appropriate also. I searched for other questions that might ask for examples but I could not find and I also checked tags that might be used for this kind of question.