Marium, as per @Andrew T's comment
Related on Meta SO: Why isn't providing feedback mandatory on downvotes, and why are ideas suggesting such shot down? (and their linked questions) or on Meta SE: Mandatory comment after downvote (and their linked questions)
There is no appetite on Stack Exchange to mandate this. If there is no comment, you can generally assume the tooltip reason:
This question does not show any research effort; it is unclear or not useful
But in any case, anybody in the community can upvote or downvote as they wish. That is one of the key permissions here.
As per your specific question you linked to, it is not structured that well - you ask for something that could be opinion based. Some may practice it one way, others another way.