This has already been discussed on MSO under What about list questions. We had our own discussion on what constitutes a list question here and I included this part of an answer from Shog9, a StackExchange moderator (emphasis mine):
I'm starting to get really tired of seeing these "list question"
discussions come up... "List question" covers a lot of
not-very-related question types, and usually ends up confusing someone
who sees the discussion and thinks, "But what if the answer to my
question just happens to be... a list?"
There is some very specific guidance in the FAQ on every site...
The first three of those tend to result in lists. But... that's more
of a symptom of an underlying problem, aptly noted by Gilles in his
answer: these are "questions" that don't really have answers.
Stop fixating on lists. Avoid questions that aren't really questions.
This is why the community and/or the moderators take a call on two counts that can make a question not suitable for the site. I wanted to repeat this here, just to reinforce WHY they are bad and what the main criteria is:
- Not constructive: "As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or specific expertise, but this question will likely solicit debate, arguments, polling, or extended discussion."
- Not a real question: "It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form."
It may have started off as an influence from one of the early StackExchange moderators on this site, but after the previous discussion on our meta, the FAQ was updated to this:
eliciting list-style answers, suggestions or recommendations on a
topic or place (unless VERY specific criteria is listed)
So even in our FAQ we don't prohibit list-style answers, we simply give that as a guideline because on a travel site, list-style answer typically fall foul of being 'not constructive' or 'not a real question'.