Someone mentioned somewhere that the show would touch on the subject and the internet blew up about it.

Jedit: This looks to be the source of it: The Mandalorian to explore the origins of the First Order

Here’s the relevant quote from Dave as I suspected:

This doesn’t turn into a good guy universe because you blew up two Death Stars. You get that the Rebels won and they’re trying to establish a Republic, but there’s no way that could have set in for everybody all at once. You have in a Western where you’re out on the frontier and there might be Washington and they might have some marshals, but sometimes good luck finding one.

Also, what could happen in the 30 years between celebrating the defeat of the Empire and then the First Order? You come in on Episode VII, [the First Order are] not just starting out. They’re pretty far along, pretty well equipped. So somehow, things weren’t necessarily managed as well as they could have been if [the galaxy] ended up in hot water again like that.

So that quote got conflated into The Mandalorian is a First Order origin story.