My 2017 Yamaha RX A770 replaced an Onkyo AVR I bought in 2000. When the remote malfunctioned it was all the excuse I needed to upgrade.
The room Equalization function, Network streaming (Spotify Premium in my case), Internet radio tuner, Bluetooth including headphones, 4K video switching, Wireless wi-fi speaker option, Modern audio codec's up to Dolby Atmos, all make these newer AVR's light years ahead of my old Onkyo in terms of technology. Worth every penny even at full list price.
I liked the Yamaha so much 3 years later I bought their RxV485 for my living room. The RX A6A looks like a fine unit too.
In terms of sound quality all 3 AVR's do a fine job in both stereo and standard 5.1 DD surround sound, with the old Onkyo giving up nothing to the much newer models. The Onkyo AVR makes a decent receiver for stereo music too, but is quite bulky.