I once saw a question that I think was titled "Do irrational numbers really exist?" and it later got deleted. I think the person who asked it had a real question. I think that person had an intuition for a number system where there are infinite numbers but no infinitesimal numbers so 1 divided by any infinite or negative infinite number was exactly 0 in that system. They probably also learned that a rational number is a number that can be expressed as an integer divided by a nonzero integer. They asked something like "Isn't square root of 2 rational because it can be expressed as an infinite integer divided by another infinite integer?" I don't remember seeing any other Stack Exchange question that appears to be by somebody who has the intuition for a number system where there are infinite numbers but no infinitesimal numbers and 1 divided by any infinite or negative infinite number is exactly 0. However, the person who asked that question probably is not the only person who has the intuition of that kind of number system. Wouldn't it be useful to undelete it so that people can see that somebody actually for real had that kind of confusion but close it because it's unclear.
Some people with a lot of experience teaching students using a student centered approach might be really great at figuring out what confusion somebody had that led them to ask a question like that. Maybe they could write comments to find out what the author of the question is really confused about and then eventually the question might get reopened.
Maybe quite a lot of Stack Exchange users have a real question but have a bad habit of asking unclear questions but have the potential to learn how to put a lot of effort into a question and the best way to make them do that is to give them an incentive to do that. Could one way to do that be to create another point system distinct from the reputation point system, where every user starts with 30 points for the entire Stack Exchange network and each day, the number of points increases by 1 until it reaches 60 and cannot go higher and they can only ask a question when they have at least 30 points to pay to ask it? That way, everyone is limited to one question a month and it forces people to ponder questions all on their own before asking them. Also when it's done that way, if we also allow people to re ask a fixed up version of a question they already asked before that got deleted or got some answers none of which solved their problem, then after they gain enough experience asking enough questions, it will come to them very naturally to make their question clearer because they will figure out that the reason they didn't get that great an answer on an earlier question is because the person writing the answer couldn't figure out what their question was because they didn't make their question clear.