So we have two choices then Monkey Man, either hundreds of world class players, engineers, techies, and producers all have become attuned to the artifacts and never heard them even on first listen or they don't exist. According to Occams Razor, the latter is true. Sure folks can become attuned to a certain sound and accept the deficiencies but not these folks. They are trained to listen critically. They hear stuff you can't that's why they tour the world and you and I argue on forum boards.You are simply mistaken in your reasoning and attempt to belittle a fine product so you feel better about your choice. That is a far more common phenomena than your little theory above. Product bias based on your individual choice...period.
You can't explain the massive popular appeal of this product away with "everyone's wrong". Too many golden ears in the equation. These people have the best amps in the world. They listen back and forth. Unlike you and I they create million selling works of art and pack arenas.
Although your theory does explain why none of you hear the lack of low end or overall muddiness to the Kemper. (just playing with you)