Guitar Volume Knob. This is a basic thing which needs to be perfect. Just have a look at B.B. King or Angus Young. But I'm sure there are also other things like adapting the amp settings which will result in bad sounds. If you want to copy your amp with one setting, this can be a solution but to find your prefered sound in their database with such limitations. Never ... I don't want to know if you can change the cab or mic, but I bet no. Just fixed settings. I can't understand that ToneX and Kemper are still a topic. Also if its my amp with one setting, I want to be able to change the sound characteristics with the tone or volume pot of guitar the way I know it. FAS rules! Just my thoughts.
You can capture amps without including mic'd cab. That offers some more flexibility as you can use IRs. You can also change cabs with captures that include the full rig. Much like with Kemper, this tends to assume where the mic'd cab part begins, if dealing with full rig captures, and it doesn't work as well for me.
Capture devices are still a topic partly because they do a fairy good job imo. I generally prefer the fractal approach, but it also has its shortcomings compared to the capturing approach. Fractal largely replaced me having to lug amps to profile, but there's amps that do no have equivalent fractal sims. Most of the time, I can still tweak the existing fractal sims to get close enough.
But some times I get better results using neural amp modeller and even tonex. It's just a different approach. I understand the convenience of tweaking digital knobs, but also why one would want to use capture based devices or software. Some times, it's just easier and quicker to profile/capture a tone if it's already set up. And in some other cases, as described, you can access tone you otherwise wouldn't have/it would be difficult to have.
In regards to the guitar volume pot issue, I'm not sure if any digital unit is "perfect" for that, much like they aren't for tones with volume pot maxed out either. But it depends on what being "perfect" implies. In my opinion, measuring methods themselves have limitations. I learned that quick when working on guitar pickups, and it was a real issue. Which is to say: I think a reasonable convo can be had about what is "good enough" of a standard.
On that end, I care more so about what I perceive as a guitar player. On that end, I think tonex with volume pot lowered generally isn't "exactly the same as the source", but great nonetheless. The standards may change from player to player, but these are mine.
