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Cause they're different and I like the "fully replaceable bearings" part, just speaks to me of being very well designed and meant to last.
Plus, although we don't know how good the sealing is yet, they might well be better than the DA7710 hubs for those who want a NJS bike that they're actually gonna ride a lot outside the track.

You missed part of the sentence off - " fully replaceable bearing races"
This is the surface the ball bearings run on. People mention changing bearings every few hundred miles, then putting new cones in there if they're worn, but often enough if the surface on the hub is worn then the whole hub has to go in the bin.