what would the point of fitting usd forks be ?
USD was originally developed for long travel moto-x bikes back in the 80's to help stop fork flex. Imagine the wheel disc and a pair of sliders boing-ing about at the bottom of 10" of fork travel.
BMW have effectively come up with a far better solution ( IMO ) by transfering fore - aft flex via the wishbone into the engine - effectively cancelling it out.
Any flex can only really happen in the outer tubes below this point. Unlikely on the road, anyway.
Thats why they handle,stop and feel so 'planted' on the road.
Phil