This type of question could lead to long lists or opinions, so I would suggest that when asking these questions people should ask for examples of X, something like
Currently, what are some examples of the most used techniques to solve problem Z? As a reference, can you also provide a link to the research paper that introduced them?
Alternatively, if you're looking for comprehensive surveys, you can explicitly say that you're looking for papers or books that do those surveys, so you could say that you would appreciate that people link to those surveys.
So, when asking that type of question, the keys are
to restrict the question in some way, so that it doesn't require long answers, which, in general, aren't really suitable for our site. Always keep in mind that your question should not have multiple answers that are inconsistent with each other (although there are exceptions to this, such as when a problem can be solved in different ways). This would occur if you ask a question that is not specific enough, but it would not occur if you ask for examples of models/techniques that can be used to solve some problem (provided that you clarify exactly what you're looking for).
avoid terms that will lead to opinions (such as "in your opinion...?" or "what do you think...?", so you should avoid questions like "in your opinion, what are the best models to solve this problem?")
Not a long time ago, we had two questions along these lines, which are ok for our site, as far as I'm concerned: