I think people are not bashing or trashing as such, rather, just wondering why you must have a flag ship model if you don't even have a need for HDMI yet and your Elite AVR is in good shape. You did say you wanted to compare the quality of a new flagship AVR to a 14 years old one, but is that the only reason?
Lots of people believe that in pure direct mode, it should be very difficult to hear sound quality difference between a Pioneer Elite flag ship and any other flagship AVR mentioned. The street price of a top model from D&M, Yamaha, Integra, Onkyo, Sony will be in the $2,500 to $3,500 range. Expect to pay much more for NAD and Arcam. There are also Anthem and Cambridge Audio that can be had for less, may be in the $1,700 to $2,500 range. That's only because they don't offer the latest features and have less channels.
So if you are only interested in finding out about sound quality difference between a 14 years newer flagship, you may want to look into the Anthem MRX-710 for under $2,000. You will still get HDMI, USB, and Room EQ capability etc whether you need them or not, but at least you won't paying for a lot of the latest gadgets that you have no need for. Also, as mentioned before, you can check out the Emotiva prepro as an alternative to AVR since you will be comparing the preamp section only right?