This is bang on. Creative is rarely perfect first time around, and it's usually far more efficient to work through problems with writers than to eject them from the project and start over (within reason, of course; you also have to be able to recognise when things just aren't going to work). 

Giving feedback also tunes you in to a writer's professionalism and flexibility, and gives the writer a better sense of what you want as a client or an editor. Our best writers tend to actively solicit feedback, and to me it's a critical part of building creative relationships. Dismiss it at your peril...