Honestly, QoS at the internet level was never really a big thing outside of special cases like VoIP. Network gear vendors tried like hell, desperately, from ar

Honestly, QoS at the internet level was never really a big thing outside of special cases like VoIP. Network gear vendors tried like hell, desperately, from around 1998 forward to convince everyone to do diffserv, qos, etc etc etc like crazy plus DPI because they thought they would charge more by having complex features and "be more than a dumb pipe." The situation now is that bandwidth is plentiful. A lot changed in 20Y. 100G and 400G are now quite cheap - most of the COGS for a given router is the optics, not the chassis, control plane or NPU, and optics has been, on and off, a pretty competitive space. Plus, almost all the traffic growth has been in cache-friendly content - non-video/audio/sw image growth has been modest and vastly outpaced by those. Not just cache friendly but layered cache friendly. Of the modern traffic types, only realtime audio-video like Zoom is both high volume and sensitive to latency and congestion. That's a small component, is often (but not always) either hosted or has a dedicated network of pops that do early handoff, and so on, so your typical backbone is now mostly carrying CDN cache misses..