However, I question the value of controls and displays for smart homes. A truly smart home should anticipate needs and adjust, without having any explicit input from the occupants and any need for them to look at displays.

Also homes can be designed for accessibility by using some very low tech, low cost techniques. A good example of this low tech approach are the accessible apartments at City Edge Canberra, provided by a not-for-profit association. These have adjustable height kitchen benches (including the sink and stove top) with a windup mechanism adapted from office furniture. The wireless controlled front doors use garage door openers. More on this in my blog.