Feedback is a tool for guiding action. Good feedback says: "I like that, more of that please." Bad feedback says: "I don't like that, less of that thanks." Lack of feedback says: "Did you change anything? I didn't notice. You might want to try something else."
Feedback is extremely important. Imagine trying to fire arrows without the feedback of seeing where your last arrows hit. You could try and try, but you wouldn't know if you were getting any better or worse at hitting that bullseye. You wouldn't know if you needed to aim a little left, right, or even if you weren't reaching the target at all.
Seek feedback when you need direction. Value feedback when you get it. Give feedback often (and appropriately...).