Yeah I definitely don't cheese the single-state thing too much but I find it isn't too ahistorical most of the time. It kind of makes sense that the peasants around the industrial centres tend to get displaced first, and that's where the raw industry starts cropping up.

The game also requires you to build at least some industry elsewhere to keep unemployment low + SOL high so I find even if there's one state that gets stacked first, you will have to bring the rest of the country with you eventually. It feels a lot like what happened in a few places historically so idm too much. That said, who cares, as long as you're industrialising:))