The motives of the folks at Harley are always suspect, but when it comes to steering head bearings I'm of the opinion that it's better to do it the right way (remove, clean, inspect, and repack) instead of just blindly pumping a ton of grease into a cavity and HOPE it flushes all the grit and crap out of both bearings. All you have to do to realize it doesn't work that well is to observe how much grease ever oozes out of the top of the tube, as opposed to the flood coming from the lower end.
It's important to actually inspect the bearings and races at certain intervals, since these unsealed bearings are subject to damage from not only dirt and water, but thanks to the imprecise way Harley sets preload they are subject to damage from pounding that can cause flat spots on the races.
One might think they could come up with a better idea for a steering head that doesn't rely on unsealed tapered bearings and imprecise adjustments. It's technology that hasn't improved much in 100 years.
Jerry