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You say that it provides sub-millisecond latency.

-- Keep in mind that I know nothing of nothing.--

--- Is the sub-millisecond from repeater to repeater or from origin to final destination that's [n] repeaters away? Won't each repeater introduce its own latency?

What causes the 4G's >50ms response time?

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One thing is that 4G is generally centrally broken out to the internet.

So let's say you're in Scotland, the packet would enter the mobile operator's network, then go to London, where they've bridged the network to the internet.

So there's an extra there and back again.

But why should that change with 5G? Couldn't operators already now route traffic to the internet in more locations?

5G isn't just the radio network. It's a rearchitecture of the core network as well.

For example you can have a 5G core over LTE.

But the article is only about the radio network. 5G over LTE wouldn't bring the problems discussed in the article.

The same applies with roaming too, so in that case there is even more latency.

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