If you make a post and you get upvotes without an explaination, you don't know what was good in your post.

You know why you considered it worth posting, and the chances are high that those who liked it agreed with that assessment.

If noone tells you why you got upvotes, you don't know what to repeat.

But you can trust your judgment, because, after all, it worked this time. It's when your judgment has failed that you need direction.