Surely that's far less efficient than just having removable trays / draws / shelves that you swap between a cupboard and a dishwasher. In the past I envisioned

Surely that's far less efficient than just having removable trays / draws / shelves that you swap between a cupboard and a dishwasher. In the past I envisioned this as being a rack on wheels that rolls into the door but continues on an opposing cupboard door (like a dummy dishwasher, with no internal parts). At which point you put a fresh rack in the dishwasher proper.