Good point on the REW/Biquad thing I would say... In my opinion, that sort of thing is often overrated, no offense to Matt at all as I do agree having such a feature is a plus. My only point is that people tend to forget (not Matt as he knows very well what I going to say next
) in may posted REW graphs, they may include the listening window, but just the MMP. Some do, but most don't. Audyssey, Dirac Live, Anthem Genesis, and probably Trinnov too (I just know too little about it to say too much), all calculate and implement the RC/EQ filters based on the data collected in multiple mic positions, so in order to say the REW filters do the same, better, or worse, it would have been a lot more work than what a lot of forum people do.
So I can really understand your point when you said "If I can get better results with ARC or maybe Dirac/DLBC that’s appealing as it’s much less time on my end."
The question is, what would you consider "better results". For me, I would consider the objective part only, that is go by measurements not by ears ("not", because it is subjective, others of course it is what we hear that counts).
In that sense, I happen to have used all 3, and I manage to get "better results" with Audyssey and Dirac Live, not ARCG, ommv. In practice, I do like ARC G as well.