My opinion is that most RC either don't improve anything or the improvement is marginal and insignificant. That's my opinion. I do not use RC at all. I run Audyssey. Compare the modes vs off. And then end up with bypassing/ turning off Audyssey and any EQ.
Even if Denon offered me to upgrade my Denon AVP-A1HDCI to the latest greatest Audyssey for free, but require shipping my Denon to NJ, I would decline. That's me.
If it were a free firmware update, I would do it.