I think Dirac (Emotiva), ARC (Anthem), Audyssey XT32, and Lyngdorf (McIntosh) do nothing subjectively to improve the sound quality when I compared on vs off.
Objectively, the FR graphs seem to look flatter. But I guess I don’t prefer it too flat.
So I don’t see the point of using these Room Correction software because of my experience (at home, family and friends’ houses, dealers).
What I do love is the Audyssey Dynamic EQ software, which boosts the bass and seems to make the sound significantly more lively for me.
Some people feel that Audyssey DEQ does too much, while some feel it doesn’t do enough. But you can adjust the magnitude of the DEQ with both the off-set level and the digital Trim Levels.
Although I think most good separates cost significantly more than AVR and I hate parting ways with any amount of money, I do feel good about owning “separates”.
My theory with separates vs AVR is that sound quality isn’t the only factor. Feeling good about your System that you look at everyday and use everyday is important.