What's even more problematic is that new North American homes are often constructed with a washer/dryer "conveniently" placed near a bedroom, typically on the upper level, and yet, they are still installed without a drain.
The washing machine, not so much. The water lines and spin cycle aren’t particularly loud, but they’re loud and distinct enough that it’s too loud for me at night.
I'd love to have an upstairs W&D, but I wouldn't install one with a secondary drain pan.