In my opinion, those word sometime is kinda useless as it doesnt help much except in praising how great / nice is the author work...
if i was the author , i would prefer something like "Suggestion Feedback" and NOT just "this is cool" , "this is great" , "love it" , "thank you" and blablabla....
But it also helps audiences whether the product is interesting or not from this feedbacks.
So you'll be happy in your thread that contains a lot of suggestions not containing those phrases mentioned above even one?
But still those phrases above are feedbacks, unless you want suggestions only.
But hey we can't stop people posting this things because sometimes that's how they appreciate someone's work.