Contrary, I could say, why was there USB host mode? I have never used this feature on the 770, N800, and N810. Not even once; I never saw a reason for it. Oh, and I'm very disappointed that I cannot charge my 770, N800, N810 not via USB, because this would be so comfortable
I wouldn't have to carry a charger around with me (which easily breaks when you carry it around too much).
The HTC phones were a bliss, because I could easily charge them via USB wherever I was.
In the end, it's marketing that decides what features need to be supported