This is my first post as a new Kemper owner. Hopefully it's understandable if massive volume is not much a part of my priorities. I've already done plenty of damage to my hearing in many years of loud situations. That's one of the reasons I would prefer a low-to-medium-powered Kemper amp module. But there are other reasons why I think low-to-medium power makes sense.
Studio use compared to massive-volume use are pretty much at opposite ends of the spectrum. That the Kemper could successfully house a low-to-medium power section seems more realistic to me. Massive-volume users needing high power solutions already have them at hand. Trying to make a Kemper power section be all things to all people doesn't seem practical. Design tradeoffs should hopefully lead to the most needed and useful options. Better in my opinion to make the Kemper amp module have great sound and be expandable with outside power amps rather than to stuff an overpowered amp section in there and suffer consistency or sound quality problems as a result.
I think high power in a small-sized enclosure like the Kemper is asking for trouble in reliability of the preamp due to heat buildup that would likely occur unless a fan is added. Fans are great if you're playing loud but at low volume they are generally audible and that is what concerns me. I am fan-phobic because background noise can be extremely distracting in a studio. Of course, other user's mileage may vary.
For my uses, something around 30 to 50 watts per channel in a stereo power amp would be ideal. 50 watts per side would certainly be a respectable amount of power in the small Kemper enclosure. If someone needs to be louder, there are already a few great options to be had. I'd be happy with a 25 watts-per-side stereo amp or maybe a 30-watt mono amp in the interests of reliability and audiophile sound quality. Stereo is already an option with an external power amp so, for me, it's not as big a priority as having an amp with reliability, portability, and foremost, excellent sound quality.
Of course, if an amp section can be designed that meets my wishes for clean, quiet and dependable power and it has 250 watts per side, so much the better!
Please understand this is just my opinion. My thanks to those in the forum who are helpful and friendly. We are stronger and more vital if everyone respects the other viewpoints even if they disagree. Everyone has the right to their opinion. All the best to each of you who are Kemper users!