The question was deleted by its asker and only he can say why he deleted it. Note that the Stack Exchange software allows any question author to delete his question so long as it has no more than one answer and that answer has no more upvotes than downvotes. In this case, the only answer was yours, and it the same number of upvotes and downvotes, so the question author could delete the question. If you wish to change the Stack Exchange rule, I suggest you raise propose as much on Meta Stack Exchange (because, there, more people will see your proposal, suggest improvements to it, and me-too it), after checking that your proposal hsn't been made there already. Perhaps you can present a convincing argument that Mi Yodeya should follow a practice different from the one imposed by Stack Exchange, but I don't know of any reason to.