I would also love to see more cleaner amps. The Tone King imperial (both channels) would be a great adiction. I would also love something like a Two Rock C.R.S. with its clean channel . I don't know why clean channels are skipped for a lot of models, there're a lot of people, like me, that use them. Seems sometimes that the main target for this machine are the metal guys who wants ultra-clean clinical sounds/high gain modern sounds and 80s hard rockers with plexis/jcm800 and all its variants but not the people which play with more vintagey sounds and style guitars.
While it seems that clean sounds are underrepresented, I think it's important to remember that a high-gain amplifier is only high-gain when the input is turned way up. Many amps that are designed to distort have good cleans with a little or no tweaking. Switch to a different cabinet and the character of the sound changes.
A Mesa Lonestar has gorgeous cleans and the Fractal model of the amp sounds delightfully close to the real thing sitting beside me now. I run the real thing on the second channel 99.9% of the time, controlling it from sweet cleans to major distortion from the guitar, so I use the modeled version the same way.
The same is true of my ToneKing amps, they're on their lead channels always, the lead gain is between 8-10, and they sound like a Marshall when the guitar is on 10, but crisp and clean when turned down. Both the Lonestar and the ToneKings satisfy my R&B playing friends when they jump on one of the amps, even though the settings didn't change, they just learned to turn down their guitar's volume. And, while I don't play metal, I do love heavy rock and tend to throw that sound into a lot of things and the amps handle it well. Slide a 4x12" cabinet under the combos and a metal-head would be right at home, especially if they turned up the mid-bite on the lead channel.
When I had my AX-8 I would have been more inclined to agree that it was oriented to metal. Then I sold it to a friend who covers all sorts of music, from jazz and R&B, country, blues, rock, and he's covering all those styles with very believable sounds from basically two patches, one is based on the Twin Reverb and the other is Dumble, and his ability to get those showed me the problem was my inability to tweak, not the AX-8. The FM-3, which I'm using currently, is even more realistic sounding and I've got a couple patches that satisfy my clean desires.
So, I'm not sure we need more "clean" channels modeled, we need to dig in and represent the existing models' capabilities better.