My approach is to actively close the question as "Unclear what you're asking" so they can't get any answers unless they fix their question. Unless it's a moderator, the question cannot be re-opened unless there is an edit made to it.
Some people see this as being overly assertive. I admit it has made me a little trigger happy on some sorts of questions. ...
Try to flesh it out into a complete answer first, then post it.
Failing that, answer a few other questions to gain the comment everywhere privilege, and then post a comment.
(You've already done the latter, but I'm answering for the benefit of others who might share this question)