I haven't been to see it in a while, but, as I recall, my general impression was that the bathroom had a bunch of interesting ideas that all came together in a way that sort of nosed out overall livability/ergonomics for the humans who might want to use it.
Some of these ideas would seem to live on in the bathrooms of modern sailing boats, but a 12 meter yacht imposes some constraints that mean that sacrificing on comfort in the interest of space efficiency is unavoidable.
I also suspect that, much like RVs or the apartments units in the Nagakin Capsule Tower, repairability and modifiability have been compromised in the design. Meaning that the whole thing should probably be considered somewhat disposable: past a certain point, the only reasonable option is to scrap the whole thing and order a new one from the factory. With typical bathroom designs, the initial construction cost may be high, but, later on, if only the toilet is broken, you have the option to replace only the toilet.