I hear teams specially from creative and client servicing complain about briefs changing on them or too many reworks or a brief losing priority. This to some extent can be avoided by communication.
I physically feel uncomfortable when I see briefs being taken and no conversation with the client for the next week to ten days till the revert is ready. In an industry where we still to a large extent live project to project, I think it's important to tell the client, we want your business, we are working on your brief.
I also believe that it adds to story telling and eventually selling if we also keep the client updated on difficulties and barriers once faces while putting together the revert. It definitely helps in bonding.
In this day and age where everything is getting commoditised thanks to the dreaded procurement teams, it's relationships which will help in value added engagements and hence work. And relationships are built through over communication. Call me old fashioned.