And even if you do convince people that AVR can sound as good, some of them will still buy separates Pre-pro, instead of AVR.
Look at me.
I don't need anyone to convince me. I already know. I'm the "choir".
Yet, when my Denon AVP-A1HDCI Pre-pro croaked after just 8 short years, I still went with another Pre-pro (Yamaha CX-A5100) because I'm hoping that it will last a lot longer.
For some, owning separates is not about needs, it's about choices and desires.