Hi everyone,
I also use MBritt exclusively.
For me, the major advantage of his strategy to use only one cab/speaker for the majority of profiles is:
As most of us use (at least) a few/several if not many profiles throughout a gig/song/rehearsal/whatever, it is important to have an overall tonal balance throughout different sounds.
In this regard, profiling through only one speaker/cab model is a major advantage, and of course having it profiled by only one person (with very good equipment, and quite constant tonal preferences), as this one cab/profiling strategy in a way "imprints" a very consistent sound signature on top of the amp, even if switching between quite different amps.
That being said, I still clearly recognize the amp type very clearly, regarding its gain structure, ability to clean up if picked light, "old-school" or modern sound, etc. - I would still say I could blindly identify marshalleque, fenderesque, modern etc. amps out of these profiles, although being profiled using the same cab.
For me, every attempt to "mix in" a profile from anybody else feels a bit like switching to a different guitar player (even if the other profile sounds killer in its own regard, just by being completely different regarding its overall sound "signature").
Therefore, I completely adore Michaels approach, and enjoy having very versatile and distinct amp models available, but still not loosing an overall sound signature that glues everything together.
Best,
Sebastian