@Aimarekin I don't think this is a good solution. In fact, questions shouldn't ever be deleted, and should all be kept for archival purposes.
I understand your concerns, but the problem with your recommendation is it still encourages users who have found a solution to their problem themselves to make their question unavailable to others who just happen to have the same question, which is something we'd like to avoid.
With the solution you recommend, if no moderators ever decide what to do with the question then it will remain hidden forever, which is not desirable.
Instead, when a user finds a solution to their own problem they should write an answer on their own question. If the user realizes the question was stupid in the first place they should just leave a comment or answer to explain why. There is really nothing wrong with asking stupid questions from time to time.
If we are to change the way deleting questions work, we should address both of these issues at once. The advantages of moderation claims is that while still allowing questions to be deleted if necessary, they would remain available to other users at least a little bit, until moderators judge it can be safely taken down.