You should note that a good design idea with its proper implementation always has say in the improvement of the usability.
Another thing that needs to be considered to say some kitchen cabinets are the best kitchen cabinets in their own time or of all time is the design idea. What is the point of having some kitchen cabinets that are constructed using some particular quality material but the design idea make the cabinets just look worse and worse. You may be able to use the cabinets for doing your primary activities but you may be not able to enjoy looking at the cabinets and optimizing the use.
b) From the design perspective