tip: katekyou "alternate universe" sort:>words
It’s because some writers are jerks. I’ve commented “I like this story” before only to be told “be specific about what you like. If not; you’re taking up space”. So I think it’s perfectly understandable why people are afraid of commenting.
That was extremely rude of the writers who told you so. I never encountered it before, but I understand why that kind of attitude would make someone wary of commenting, to everyone's loss.