I have questioned a publisher's depiction of what is needed (river wise and other geographic attributes) for a given map commission. In one case, a publisher deferred to my judgement on how best to depict it properly. In another case the publisher defended his geologic incompatibility with specfic requirements for a unique setting, so in that case, I shouldn't change the geography. I never blindly create a map for commission without requesting additional information concerning geological/geographical inconsistencies I might find in a publisher's rough draft for reference. I always ask first.