My belief is that if a question is really too broad, too bad, too much opinionable. The fact will prove it in a very short time.
The following question however had already got many interesting consideration in the comments. When it will be auto deleted every consideration will be lost.
The user couldn't answer the question since it have been locked for a reason which is not completely correct (see my answer to the comment).
Do you consider the deletion of question like this useful? Can you explain the pragmatical advantages reached by this?