Wow!
Actually, some 'steam' carpet cleaners of the 1970's did this and yes, they had safety disconnects to protect you when you pulled one plug. You did have to wander through a house, tho', until you found the right outlet.
Miele, at least in Germany, offered appliances for many years which would accept single, split or three-phase. Since normal people tend to call North American split phase 'two-phase' (we don't on this site after a horrendously nasty war waged by the anal-retentive vs. the humorless)I am guessing they just mislabeled it so.
By the by, Euro dryers tend to run at 3600 Watts (I am not speaking for the UK here, may the gods forfend...) Let's see: 3600 Watts at 125V is 28.8amps, no? (we are pretending that AC behaves as would a non-reactive, purely resistive DC load, just in case some of the hyper-correct are on-board).
Still, I am curious...if anyone has any real-life experience with these, it would be great to hear it.
Split phase does offer cost savings in real terms. Anyone seen the price of CU lately?!