What should I use it for?
In case of posts - should I downvote things that I don’t agree with? Or things that I don’t want to see in my feed (posts with low amount of votes fell more to the bottom)? Or things that I consider harmful/stupid/younameit?
In case of comments - should I downvote something that I don’t agree with? When should I use this button in case of comments. Or maybe I should not - cause what’s the point, actually?
Fair enough, but I still think this depends on the community. A community focused on professional discussion about programming for example would probably have members that follow the voting rules more closely than a humour/meme community.
I see what you mean, but still… what I said above is still true for both of those communities, and such rules and their implementation would benefit both of them.