That's how the Brits do it and I think the Germans too.
They do all have extensible batons and training in how to use that to defend themselves against somebody who is a bit handy with their fists or waving a blade about while they retreat, as well as training in how to de-escalate.
Even when there's an armed suspect retreating is very often the appropriate thing. Because you've got time and numbers on your side. Why risk getting stabbed (or shot) to make an arrest now, when in the not too distant future the suspect will be asleep and you or your colleagues can trivially disarm them?
There are scenarios when police need an immediate armed intervention, but they just aren't (and shouldn't be) common enough to justify giving every single cop a handgun and the training needed to use it effectively.
Of course the Americans seem to have largely skipped the second part of that, which doesn't help at all.
I do agree with the training in de-escalation though. German Police has a much more extensive training then the US.