Your client may not have the needed design maturity to understand what you are doing so the work you do can be used well. Your time with them may be limited, and they need skills transferred to their people so the project can continue in your absence. Maybe the engagement is to actually build design capability into the client.
Offering development of a level of design capability as a part of your pitch can be a game-changer. It also makes you a better designer when you get to do it.
For Stephen Collins and his studio, acidlabs, most engagements include building design capability as part of the gig. Come and let's discuss what that's like.