This kind of demo is why arranger players aren't interested in workstations...
I would have rather seen someone play some standards, songs with some of the styles rhythms you have on an arranger KB, waltz, polka, chacha, merengue, R&R, 6/8 ballad etc.. on the KRONOS..
Horses for courses, Donny. Simple as that. On a purely synth forum you'd probably find your question turned 180 degrees with someone asking 'why doesn't the guy play something we can relate to', not this Broadway musical stuff. I don't think anyone in the market for a Kronos is looking play pop stuff, for want of a better term, do you? That said, Baartmans, et al, could probably manage it. As has been said so many times, it's the player, not necessarily the tools.