Yes, I subscribe to Dean Bubley and he is a very useful corrective to the telco boosterism on things like overselling 5G, network slicing, the dumpster fire that is RCS and so on.

Still, it's important that latency is top of mind for the designers of 5G, as it gets short shrift far too often.

Yes, backhaul (the connection from the tower to the Internet via the carrier's central facilities) dominates, as well as queueing latency for packets waiting to be delivered to phones, since traffic is overwhelmingly downloads.