I'm curious. Has anyone booted up a Fractal model and thought, "that was kinda underwhelming", then checked the bias and found it was biased cold, increased the bias, and then what they heard was solid gold? Because that is a real phenomena that people experience with real amps.
Also with real amps you can roll tubes. And speakers/cabs.
I don't know the answers. My impression of models I have played is that they were somewhat generic and had more EQ sweep or range of gain than the real amp might have. So the model is made to work with a larger variety of setups. I can get them to sound as good, BUT the feeling is that you really have to find the sweet spot, where with a real amp, no matter how you have the controls it sounds good.
I have heard people in Fractal land say they had to spend a lot of time tweaking filters/eq. Heard that even more in Helix land. So I'm not sure they are 100%. Close enough to not matter, but there are some intangibles that may be lost.