Yes, Panasonic has front-loaders, including one from a couple of years ago that has an inclined-axis drum and some very clever energy-saving features I can't recall the details of at the moment. They also make twin-tubs with a timed pre-soak feature. None of these are marketed in the US yet. I have good connections with Panasonic so one of these days I'm going to send them a marketing case for bringing these products into the US.
That unit with the waterfall feature is the same form-factor as the standard Japanese washer, plus the clever design with the impeller. Notice that the impeller has shallower ridges than your typical pulsator; probably because it spins faster (for the pumping action on the underside).
Re. Japanese plumbing & water conservation: If you've already washed your body thoroughly (and I do mean thoroughly!, as in, wash between your toes and don't forget your bottom either!) in the shower, and let that water drain out, and are taking a bath purely for relaxation, the water in the tub will be quite clean enough for washing your own clothes and possibly your partner's. The obvious exception of course is if a person has a contagious illness, in which case one can't be too careful.
Note also, the rinse cycle will be using fresh tap water, so by the time you're done, anything that might have snuck in from the bath has been suspended in detergents and then flushed out.
What you don't want to do is recycle used water from the washer into the bath. You don't want to bathe in water that might have some detergent residue left in it, because it could be an irritant to sensitive skin areas.
However, you can use the water from final rinse as wash water for the next load, this is entirely sanitary and is common in Australia due to the necessity of serious water shortages. So you could save that water in a tank, and then put the suction hose into the tank for the next load.
Also, when you're going to take a shower or bath (or run the dishwasher for that matter), save the "purge water" (the cold before the hot comes up, typically 3 - 5 gallons) in a tank for a few days, and then use that as your water source when you have enough for a load of laundry. Zero waste, and the water is fresh from the tap.
Re. the Japanese squat-toilet, the case could be made that it's more sanitary than the USA version because you don't sit on a seat that could collect germs from water droplets during the flush. Also the squatting position is supposed to put your lower body into a more correct configuration to poop, vs. sitting down. (The opposite case is the "disabled access" American toilet that's higher off the ground, to the point where sometimes your feet are off the ground. You do not want to poop with your feet off the ground; that can lead to all kinds of problems...)
Generally, Japanese culture is if anything *more* concerned with sanitation & hygiene than US culture, due to the necessities of public health in ultra-high-density urban environments.