Real shame I have a great sounding integrated sitting right in front of me that disproves your entire post.
Further, I don't know where you get the idea that BASH or similar isn't being used. NAD's hybrid Class-D as well as the Yamaha EEEngine are derivatives. Not sure which are licensed but similar ideas. My ICEpower amps however, definitely not BASH, are the equal of mid-range linear amps, the better of some top end ClassA but awfully warm sounding.
Further, I don't know where you get the idea that BASH or similar isn't being used. NAD's hybrid Class-D as well as the Yamaha EEEngine are derivatives. Not sure which are licensed but similar ideas. My ICEpower amps however, definitely not BASH, are the equal of mid-range linear amps, the better of some top end ClassA but awfully warm sounding.