Guess it has to do with water temp
Here up in the Alps cold water is really chilled water, so a cold fill is prone to the "orange" issue.
Down in the plain in our town cold water is "warmer" and we never have had any problem. Even in scalding August, when I switch off the gas heater as I shower tap cold and the dishwasher is filled with cold water too
Toggles, only B.S.H. (Bosch Siemens Neff) require preferably a cold fill, because of the heat exchanger involved while drying. Otherwise since the seventies Zanussi and Miele manuals recommended to connect dishwashers to hot water supply in case of a cheap hot water source (gas heated, solar heated, heat exchangers from industrial processes ...)
Current TOL Mieles (euro versions of La Perla) have a "no heat" cycle that relies only on hot fill. To have a decent temp in the main wash it does two prewashes so at the 3rd fill water is hot enought. Anyway if the water isn't hot enough there's an alarm that stops the machine and warn to raise the heater or use a heated cycle
It's a pity this cycle isn't available on all models.
It could be very useful while one has washer, dryer, oven and dishwaher all working in the meanwhile