Dont the swift grinders use 2 different grinds for the 2 different baskets? (The single is ground finer to make up for it being half the height) and for this reason it has 2 hoppers and 2 adjustable burrs etc... and only one PF holder, and you select the button on the front you want (single or double).
Thats my understanding of how they work (having only ever seen one at one one of the places I visit).
I think they also dose 100% consistent as they stop the grinder based on the height of the puck.
As you mentioned its all for consistency between users. It also is a doserless grinder so there are no grinds going stale in the doer.