Why so many? Just speculating on the Kemper here, but my experience with the Axe FX and the only thing I have found as a drawback is the latency when changing presets in a live performance. That and making sure your output volumes are spot on between presets. I would imagine those Kempers are for multiple players. But, each Kemper in the racks are set for different presets. It is much cleaner to set up the digital boxes like multiple heads with a switcher set-up and change boxes for 2 preset tones, as opposed to switching presets. Again, speculation on the Kemper, but I have that small issue with the Axe and the latency.