If you are talking design that is used for logos and whatnot, that's on the client: they make the final call after all. Some might just take whatever the designer gives them, but I imagine most want to do some bikeshedding.

In fact I suspect most of the value (for the designers) of those exercises where designers involve the client and make mindmaps and select "values" and whatnot is to trick the client into a self-made cage, resulting in manageable bikeshedding.