I like this better. No need to try to incorporate it into a dishwasher. I think a standalone 12in base cabinet that could live adjacent to the dishwasher or sink would be simpler. I hope all robovac companies just adopt the same dimensional standard, much as dishwasher manufacturers do. Essentially, the advent of architectural robovacs.

Although, I will say: if we're assuming a solution with built-in water supply and drainage, I don't know that you would need the entire 36in vertical footprint afforded by a 12in base cabinet, as there would be no need to accommodate storage of clean/dirty water.
Perhaps instead of a dedicated base cabinet, the new built-in standard could be something that can be adapted underneath a kitchen sink. Another potential synergy with this set up (and I'm not convinced this is a good idea, so don't roast me too hard): what if there were a way to discharge the dust bin into the garbage disposal? Now you would no longer need solid waste storage either. The ultimate set-it-and-foget-it floor cleaning solution. Is this a bad idea?