If you attend your friends concert and don’t like the show, what do you say?
You could say, “I didn’t like it.” But would that help your friend do a better show next time? No.
You could say, “I think your music may appeal to people who enjoy the love child of country, hip hop, and jazz… I know some people like that. I’ll share your music with them.”
The former could be useful. It’s honest. But you aren’t helping your friend grow.
The latter is generous. Your feedback helps your friend find the people who would enjoy their craft.
Effective feedback pushes work forward.