I would 100% agree if I had always something interesting to comment; but when I don't and I think I had a good time reading the article, I prefer to shut up and just upvote. I like to compare it to the Obama thumbs up with beer meme (note that I don't compare myself to Obama) But yes, leaving a comment sometimes lead to nice conversations, knowing the person a bit better and maybe having fun.
Cheers! 🍻