(...) I don't understand the fear of more movement either, which dominates so many plans.
I feel the same way. In everyday life, any movement is optimized away and in the evening Mom/Dad then stand for half an hour on the stepper in the expensive gym and stare blankly out of the window.
Of course, if you can afford a separate utility room on the upper floor, why not. But then in summer it will probably be the dryer anyway... Whether that is the ultimate wisdom in view of the glowing debate on CO2 reduction is doubtful.
(Anyone arguing here that the electricity would then come from their own photovoltaic system unfortunately hasn't understood the core issue either)...
But in the bathroom? The bathroom is already the bottleneck in any 4-person household, especially with 2 daughters. And then Mom is supposed to do laundry there 3 times a day, empty it, hang it up, fold it?
Better in the utility room, where you don't disturb anyone...