I guess we look at things differently
I've heard the RXV2500 and I don't think the pre/amp section has changed with respect to the 2600. And your right. Its a solid sounding receiver. And then I heard NAD; a T753 hooked uo to the same speakers as the Yam2500 and too me, the NAD sounded better. It sounded like it had just a bit better control on the bass and the seperation and nucances came out a little more pronounced. But compared to the Yammy, the NAD is a stripper in features. Would I choose the NAD over the Yammy if I had the money? In a heartbeat. Would I feel like I was losing something since I can only afford the Yammy? Nope. Its still a great sounding beast.
What I'm getting at is this, I value sound over features if I my budget could afford my taste. Not saying you don't . But to me the features just doesn't make that impact to me. If I can get better sound with less features, than I'm perfectly happy.