I disagree, giving up creativity and simply becoming a design workhorse is a terrible position to be in.
If anything it should be the client becoming part of the design team, fair enough they cannot envision what they want the end product to be but they have a good idea for what they are wanting, and if persuasion wont alter their judgement then there is no way I would go with what the client demands.
For instance, I was just doing a logo for a company and they said they wanted it to be a rainbow effect. I spent ages convincing them it was an awful idea but they wouldn't let it go, so I ended up basically saying I was not willing to do it as it was bad practice.
Eventually we came to an agreement that the best idea would be to use primary colours and it worked out great, both of us were happy with the outcome.
If I would of made it in a rainbow style I would be totally ashamed of myself.