Do you currently own or have you owned high-end separates and compared them to AVR and found that the high-end separates truly sound better and last longer?
I have friends who have owned high-end separates that required repairs within 6 - 7 years of ownership. The repairs are usually about $1,000-$1,500. They will tell you that high-end separates can malfunction and require costly repairs after the warranty period expires.
I've owned Denon AVRs that have never needed repair.
So I suppose it all depends on your personal history of repairs.
If you've owned mid-priced AVRs that died after 3 years, then you will have a different opinion. You will feel that high-end separates will last longer.