I hear this kind of statement a bunch with reference to “tubes and heavy iron;” but, I have to say that when I consider my playing time on SVT’s, grind, overdrive, and compression are wholly unrelated to any sounds that I go for with the SVT. I much more associate the SVT with undistorted slam; like hitting a granite boulder with a sludge hammer.….The grind and overdrive you get from an SVT along with the natural glassy highs and real tube compression is something that the 7 Pro will NEVER be able to achieve. It's just not possible...
And, so part of the problem is that we all use these amps in different ways.
You may indeed be coaxing grind and overdriven sounds out of your SVT, and be unable to get those sounds out of the newer amp technologies. But, the sounds I use in an SVT, which I very much admire, can readily be had from newer amp technologies. My Demeter VTBP-201 into a QSC GX7 does every bit of what I get from an SVT; and then some. My Mesa TT800 does enough of it by itself to be useful. Etc.
Point is that there is no absolute truth. We are all very different players doing different things with our signal chains. What may be true for one is not true for all.
In terms of modeling; I just don’t have a reason to go there. But, again, that’s me. Someone else will come along and take that somewhere new, and there may be a whole new thing. Just part of the deal.