Not quite.
The immediate response to come into my mind is the ease in saving presets and recall them togheter with the rest of the performance.
One other would be one less piece of gear to carry around.
Anyway, what is so smart in adding a reverb into a keyboard, withour the VH? Doesn't even the least of the mixers for PA have a form of reverb/delay? As for the quality of VH, the Korg's one is not a pale shadow of anything, just has less features. Which is normal, but the quality just the same as their counterparts in Helicon's offer.
I am sorry for Roland not adding a real Vocal processor to their BK. THAT is something that I'm afraid does not fool anyone.