This website, evaluates question only on the basis-of public-votes, where the asker do-not have any right to put any evaluation to own question. But there is need for judging the question also from the viewpoint of the asker's own.
The site requires downvotes, or mark for deletion etc. to distinguish 2 type of question ( type-1: some-of the questions are basic. They adds up the knowledge to future. And type-2 : that do-not adds-up significant-knowledge to the future. (Since this is a publicly-edited site, all-sorts of questions indeed come).
Now, these 2 (or actually many-more) -type of questions. It is as-if assumed, that, if a question attract more votes from other-user, it is useful. And if they accumulates some downvote ... then it is assumed that, the question has no importance for the future, and become prone to deletion.
But that is not the practical truth. In many-cases (though not all-cases), as an asker, I (i.e. creator of the question), feel some future-importance of the question, but since such- judgement is a subjective-process (same thing felt as different, by different-persons) ; often a good question is mis-rated by other users. Later-on, on further manually-correspondence and discussion, the rating get up-rides in a drastic rate, or sometimes get deleted before they reach to right person.
How it could be resolved?
No I'm not telling to stop downvote or deletion-system. but I'm telling to change the criteria for deletion.
The asker could define the type or quality of the question, by selecting some options/ categories/ form-fields.
(Since, On a problem/ question, only the asker (the creator) can tell the best.)
This will Not add-up a vote to the question, but will help the judges to better-understand the question, on the basis of asker's evaluations, and also will help to automatically (programically) slow-down the deletion.
Obviously in case of severe misrate by the asker/ vandalism ; moderators could re-evaluate the question.
(These are just some examples. they could be further)
Thus the website can ask categorie/ quality of the question, from the user; that would help a lot in sorting-work. ( Also, The website could warn the users to not-to-post homework-style question, or make sure it is a conceptual or rare (unavailable on web) question)
Also, the website should ask the user about what should be the fate of this question, in another form-field. (Also If it is a transient-requirement question, website could warn user. The website could warn the asker to ask such question in the chat-section).
These will improve question-evaluation, will help to save proper-question to future for the right-person, and to reduce stack-overloads (bad-questions)by preventing (instead curing) programically, on basis of evaluation of