This has been the case for a while. When new modelling iterations come along, I want the gaps to get smaller. That’s what the discussion is about. We’re already well past this. Once you know where to look for differences, modellers do reveal themselves somewhat easily (even if most people would be fooled by it). Most people could be fooled by a Kemper tone but it doesn’t mean that there isn’t room to improve accuracy. If Kemper came out with a new update that sounded better in terms of gain and dynamics but the results were further from the source, you’d have mixed feelings, right?
I think it is completely reasonable to want capture and modeler tech to get better. I think that it is getting better, and I think that Proxy will definitely be getting better (but honestly, I would prefer they update the reverb engine first :) ).
I also believe that the focus being ONLY about the capture accuracy in a product with as many goodies in it as Stadium is kind silly.
If a Kemper MK1 user ONLY looked at the NULL tests, they might conclude that an MK1 is about even with Proxy in Stadium and therefore MK1 is just as good as Stadium. Clearly that isn't the case for a number of REALLY good reasons.
As for the Kemper having a version with better gain and dynamics, but further from the source .... very good question. I don't profile tube amps myself (sold all mine about a year after I bought my Kemper). I think I might actually prefer something that subjectively sounds "better" and feels "better" to something that simply "more accurate".
But isn't this true of one tube amp vs another?
No one would EVER say a MESA Triple Rectifier sounded exactly like a VHT UltraLead .... or that one felt like another, yet I greatly preferred my UL over my friends MESA in both the way it sounded in the mix AND how it played live.
What is interesting is that once I had a Kemper and had a zillion rigs of amps I could download and tweak, I found stuff I liked even better than my VHT UL.
Are they accurate? Beats me. Does it matter?
Very interesting line of discussion.