The advantage of a feedback form is that the developer can come back to you with suggestions, ask you for details to reproduce a bug, etc. If you just go to the App Store and leave a (negative) review, there is no way for the developer to contact you. Hence the dialog/feedback form pattern. Allowing developers to respond to reviews on the App Store will help with this problem.

but what if I dont want to give any feedback at all? When I am using an app, I only want to use the app, not rate it, and not giving feedback.

I'd wager it probably won't help at all. Developers have been able to reply to reviews on the play store since 2013 - yet applications are still rife with this kinda shit, and not just the older ones that haven't been updated since.