I bought a brand new ~$900 GE dishwasher last year (for a non-intended purpose) and needed to take it apart - for reasons.
IMO, the engineering in this thing was just marvelous. It was almost entirely tool-free click/snap fittings for full disassembly and reassembly. The parts were good quality molded, stamped or machined. It was clearly a master class in balancing competing trade-offs (price, assembly labor, reliability, noise, power, efficiency, etc). The simplicity of the thing was really remarkable.
Water falls into the side at whatever rate your tap delivers, and when a pressure sensor in the reservoir indicates enough volume to start, the thing begins. It does this a few times, pumping, re-pumping, heating and replacing that reservoir depending on the selected cycle, but overall, the thing is just incredibly simple and (hopefully, somewhat?) reliable.