Friedman is right, the digital stuff has not the same physical interaction as the real thing. But, he also accepts that Kemper is "taking the sound", which is exactly the point. Many users are willing to sacrifice part of the interaction provided by heavy physical gear and get that sound with some credible interaction from convenient and cost effective gear.
Just take a look to the digital piano profiling/modeling industry, which is years ahead of guitar amp profiling/modeling R&D, chasing the "real" sound of physical, very expensive and huge pianos. Yamaha R&D has delivered cost effective Hybrid pianos, Digital pianos, and Keyboards that offer profiles of their much more expensive and huge Acoustic Concert Pianos and even they are improving the keys weight and sensitivity trying to be closer to the "real piano" as well.
It is true that Digital Pianos does not offer the same physical interaction that you get from an acoustic Piano, but thanks to the technology, many users and professional musicians can enjoy credible piano sounds at home, studio, stage, everywhere with the convenience that a beautifully expensive, heavy weight Acoustic piano can't offer. We can be sure that the world has much more piano players after this digital wave started.
By the way, do you hear your keyboard players complaining about "piano in the room" or being so worried about the physical interaction of their keyboards compared with a real piano?. How many bands travel with "real pianos"? Perhaps Elton John with that million dollar piano show.