The main thing is the form factor. The V5 is small enough to fit onto the top panel of my G70 (and most keyboards have enough room somewhere) where I can easily get at it while I'm playing the controller.

TBH, to save a chunk of money, I might be OK with him dropping the audio inputs.... sure, might be nice to route a guitar patch through the Leslie sim, but I can do that internally sort of adequately. And A/D converters always add to the base cost.

The big module might have been a good marketing step from the keyboards... get the most you can to start off! But I have a feeling it's going to be a V5 sized module that will prove the really big seller.