Most of the time, specific amp models get overlooked because there's already something similar in the catalog, or an amp company is striving for a classic design that's well-reflected in existing models (like Wizard vs. vintage Marshalls). Personally though, I tend to strongly disagree. I've been told to go try the VH4 model as a stand-in for my H&K Triamp MKII, and it's an ill-informed assumption that they're close. But I guess to some folks, Porches and Benzes are the same, yeah?
That aside, not having a manufacturer's "official" approval never stopped anyone from putting out their model of a Soup Pro or a Fander (not even Fractal). All Line 6 got for their trouble was getting to be the only kid on the playground that gets to use the real name. I don't know if that's where I would prefer my modeling manufacturer focusing their attention, but I'm sure the Line6 army will swear they can hear the difference that second V makes. Slow clap.
I'm confident that over time, the Fractal catalog will expand to include far more variety (and hopefully some REVV and Wizard stuff!), but for now it seems that they're primarily focused on:
1. Perfecting the technology of amp capture, non-linear reproduction, and minimizing the processing power required to do it.
2. Prioritizing amps that expand the palette of total possible tones, and that resonate with as many players as possible, first.
So yeah, until then, just go ahead use the VH4 model for everything no matter what. LOL