I believe this is often a conflict... many things can be done better and nicer, but also with more planning, more prone to errors, or more expensive - be it multiple meters, centimeter-precise positions of switches, spotlights, tile joints, or roof connections.
The client has the free choice; often, however, not the willingness to pay for it. Demanding changes afterwards in their favor without additional costs with the motto "I assumed that" or "at Aunt Erna's it's done like this anyway" simply doesn't work. The contracting party calculated as they did - often with simple solutions to be price-competitive - otherwise the client would have gone to the next one with boots; thus quite legitimate.
The only thing one could perhaps sometimes hold against the planners is that they do not provide enough clarification and information about possibilities; but often, maybe also from experience, because clients then want gold but are only willing to pay for copper. For example, we were often only offered mid-range products - e.g., for bathroom furniture; but I am mostly satisfied with that, because it is really the case that the top class is nicer, but we currently cannot/will not afford it. Had we been offered the top class, both sides would have simply invested more time and been frustrated. Sellers and planners are of course not clairvoyants but experienced people and certainly sometimes err in dealing with the counterpart.