AXE FX III is still unable to model the impedance curve and the speaker/amp interaction which makes it less authentic. Currently Kemper is the only modeler that accurately captures the whole thing including speaker interaction and speaker saturation, An impulse response used by the AXE FX has zero information about Speaker saturation. A kemper profile has all that. Y
You make your own conclusion based on the facts stated above,
If you have no idea what I'm talking about, next time you buy impulse responses, make sure to ask the seller about what to do about impedance curve or resonant frequencies of the corresponding cabinet and whether they measured and can provide you with that information,
To be honest FAS emulates speaker saturation and impedance curve.
Neverthless, it is always a simulation, so it can be more or less accurate.