Presumably they will obsolete use of USB4 over non-Type-C cabling since the older 3.x compatible connectors are hacks. That means, moving forward, everything from 1.1, 2.0, 3.x, and 4 will run on the same cabling.

Intermediate hubs will downgrade bandwidth if they can't support the same speed as their upstream host so there will be an element of mystery there without clear markings.