"As I've said above, Fagor and Electrolux had a washer that stored rinse water (before the softening rinse) for the next wash. The Lux model was quite a while ago, but the Fagor was fairly recent. The Reason washing machine also had a holding tank underneath the drum - not sure if it recycled the water, though."
Instead of experimenting around with nearly waterless top and front loaders, maybe engineers should look to the past and learn from previous experience.
On another note, what I really liked about my suds saving Westinghouse top loader was the level of control I had over the entire laundry process. It was completely automated, but, at the same time, I was able to control and change every step of the cycle to what I wanted, which is next to impossible with most modern machines.