Discussions about why comments are downvoted are usefulWell, you'd have to convince not me but the moderators of the site of that. They're quite explicitly off-topic in the written guidelines. Have been for many years along with 'neither downvotes nor upvotes come with an explanation obligation'.
And more generally, it's social interaction, not a compiler. Like most social interactions and for most people, it's not that hard for a newcomer, with a bit of participation, to sort out the context and written and unwritten norms, without constant and explicit error messages.