Most customers often equate interior design to good looking furniture & carpentry. In reality good home design incorporates 5 elements, namely - Furniture, Furnishing, Lighting, Painting and Décor. A good home interior designer helps weave these 5 elements around the life and lifestyle of the owning family - things such as hobbies, presence of elderly at home, grocery buying schedules, guest movement etc. to create tailor made, cozy and warm living spaces for the family. Hence when working with a designer one should expect more than just good carpentry and looks.
That said, customers just expecting carpentry or looking for someone to execute pre-determined designs should avoid hiring a designer as the lack of creativity may lead to detachment of the designer resulting in poor quality work.