I have a complete setup from the 70s. NAD 3045 with new acoustic design on the panel, technics record player and Braun speakers. Sound super super good. The increase in soundquality since that tech is marginal at best. The biggest improvement regarding class-D amps is power consumption and weight.
> The increase in soundquality since that tech is marginal at best.
I'm glad you enjoy your system, but, having upgraded from a very, very good 70s system to a pretty excellent system using contemporary parts, I can assure you that both objectively and subjectively your system from the 70s is inferior, and the difference isn't marginal. It's massive.