Well after reading through this post, i think i get the point your trying to make easybeat.
After thinking about it, i guess i would have to say i like getting comments, whether good or bad, not for my ego or to feel puffed up or in some cases deflated lol but comments/feedback give the singer, songwriter, musician a general feel of how they are doing, how they are improving, where they can improve, what works, what doesn't work. So yeah i think it is important to give feedback to the person/persons.
I like to give feedback/comments to people after they have posted their song/music/songwriting skills etc ..... I think they have taken the time and effort to do this, then yep they deserve some feedback. Mostly I am able to give positive comments, occasionally I might make a suggestion I think might help them make it better (not that i am any expert i might add and you all know )
Laugh Lots ... Forgive Much ... Love one another
Covers and some Originals found over there ------- > https://soundcloud.com/ukulelejan