I've owned four Denon 3000 series and one Denon AVR-5308. All have worked great and still working for over 6-9 years now.
If I were buying Denon, I would buy the 3000-series or higher. If I were buying Yamaha, I would the 1000-series or higher.
Considering that many people upgrade every 3-6 years anyway, I think a Denon-3000s or Yamaha-1000s (that could be on sale for $600 and lasts 6 years or more) seems very logical and economical, especially if it sounds just as good (at least in the Preamp section when using an external amp) as a $2K-$4K Pre-pro.
And if the AVRs sound as good as the Pre-pros, does it matter if they have too many amps inside the chassis? If having too many amps inside the chassis does not adversely affect the sound quality, why does it matter, especially if the cost is significantly less ($600 vs $2,000)?
I think we all agree that it hurts a lot less to replace a $600 AVR every 6 years than to replace a $2K-$4K pre-pro.
If a robot from another planet asks us why we would spend $2K on a Pre-pro that sounds just like a $600 AVR (used as a pre-pro) and then replace it every 6 years, I think we would have a difficult time explaining it.
Audiophile: Pre-pros last longer
Robot: But you replace it every 6 years and the AVR lasts longer than 6 years
Audiophile: Yeah, well I want the pre-pro to last 19 years even if it's obsolete
Robot: $2K pre-pro/19YR= $105/YR, $600 AVR/6YR = $100/YR
Audiophile: With Pre-pros, I can just replace the Pre-pros and keep the amps.
Robot: But you can do the same with the much cheaper AVR
Audiophile: Pre-pros have better logistics - AVRs have too many amps inside
Robot: But AVRs are so much cheaper and sound the same
Audiophile: AVRs have too many features I don't use - it's a waste
Robot: But AVRs are so much cheaper and sound the same
Audiophile: Oh yeah, well Pre-pros have better measurements
Robot: But AVRs are so much cheaper and sound the same
Audiophile: Oh yeah, well I feel happier with Pre-pros. And they do sound better to me. And I don't care about any double-blind testing. I trust only my ears.
Robot: Oh, I see, humans are very strange