Why does this configuration work?

Question

Mikrotik

Why are parents given priority here https://wiki.mikrotik.com/wiki/DSCP_based_QoS_with_HTB although it says here that they only work for end queues https://wiki.mikrotik.com/wiki/%D0%A0%D1%83%D0 %BA%...

Answer 1

If you look at the HTB-token diagram, you can understand that all parents allocate only tokens for their heirs, but those "queues" that have no heirs directly enqueue packages.
That is, a queue that has successors is actually not a queue, but a kind of divider that allows you to understand to whom and what to select which queue.