I have still not very well understood the site rules, and there is no guide. Since poetry is inherently vague (it might even be desired), is it "non-constructive" or "not considered a good question" to ask for an interpretation of a specific poem? (I have roughly browsed recent questions.)
OP edits: Thank you for reopening. I am sorry to rewrite this question substantially, but initially I did not expressed well. So, poems are on topic. But what kind of questions? Can one ask the possible meaning of a certain line, or the overall context of a poem is according to your interpretation, or the symbolism a certain keyword....
These questions are related, and it is often not easy to make a clear cut between them... When a possible context is pointed out, the confusion might be automatically resolved.
Indeed, a reader is often "overall confused" by a poem, but asking a specific word or line might lose the overall picture. When a reader does not make sense of a poem, he/she does not even know what to ask. "What does that mean" is too broad, but "What does that word mean" is too narrow. Neither do I insist a complete free of restriction, but the line must be decided by the community.