Tactical combat games like Flashpoint or Command require a bunch of different scenarios, and the scenarios are (comparatively) easier to do, because the meat is in the tactical interactions; in some ways, the context can be anything. A game like this, on the Thirty Years War, is all about context. So IMO just creating a bunch of scenarios sort of misses the point. It's really about the war as a whole, and perhaps certain periods of time within that span, and that's pretty much what you get here. So while, sure, more is better in a lot of ways, it all depends on what you're doing.
And I have to second the notion that this is hardly a well-known period of military history among non specialists, so cheers for having a solid treatment of the war available at all.