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?
That’s a very good point but it assumes that contexts are equal which not true at all. If you compare two identical products that might work but for complex communications to imply that they can be compared on a subjective basis is a bit silly.