Keeping the queues short with AQM makes every application share more fairly. Low rate applications like gaming and zoom benefit. QoS, as you describe, has been

Keeping the queues short with AQM makes every application share more fairly. Low rate applications like gaming and zoom benefit. QoS, as you describe, has been tried (see diffserv and intserv), and fell down because mostly everyone felt "their" application had priority. Being fair, instead, and improving statistical multiplexing in particular lets 'packets be packets'.