Because as long as people buy in to the Honda "quality and premium", there's no reason for them to use expensive or updated forks. Why models like the current generation VFR800's ever left the factory doors with the forks they did I don't know (they were quite expensive when released as well).
Even our 919's would most probably have sold better with USD forks. Not just for functionality, but just as equally for nice proportionate looks. The 919 looks great from the headstem backwards, but the front end looks very sad and aneamic, like its something that should belong on a 250, not a 919.
I dont care if the conventional forks they used instead works well or not, the front end look on a naked is very important and should fit the rest of the bike.