finally you example of the USA in 1861 is a very bad one. This is a country that went from having an army of just 16,000 men to over 1,000,000 at its height during the ACW. If you ask me Father Abraham's national focus was working.
Well, yes, once Lincoln got working it was okay. But I was referring to his predecessor, Buchanan, and the administrations before him, who had zero influence at all. I meant those, not the Lincoln administation. (Whose party would enjoy strong support in the north, once the democrat-voting Dixie POPs have seceded.) The period of 1855-1860 was when federal power in the US was pretty much at an all time low. Buchanan was so weak, he did not even try to avoid the secession of the southern states. Within the game, you would probably try to lower Dixie MIL to avoid secession, right? Having an ineffectual government would mean nothing you try works, and secession eventually happens, maybe triggered by a MIL increase following the victory of a republican candidate...
I don't like this for three reasons. Firstly if you are in trouble national focus should be a tool for helping youget out of it. Secondly the more complicated we make a system the harder for the AI to use.
Okay, I see the problem with the AI.
But then what is the exciting aspect about national focus? Where does it feed back to the other activities of you, the player?
You mention that it does its work steadily and slowly (by encouraging migration, industry building etc over a longer time span). To me it sounds like the way you use the focus is very straightforward, and there is little variation in the way you, the player, use it. In other words, what is the strategy? Is the feedback from using a focus always positive? Or can a "focus project" (like the encouragement of industry or trade or crime fighting) ever backfire in some way?
I haven't played EU:HTTT so I don't know exactly how it works there. But a game mechanic which only has positive effects sounds very bland and boring, to be honest. I would have expected that focus is something like an investment, your government invests money and sweat and tears, and expects to see a payoff in the form of beneficial effects later on. Not an always positive game action that comes with no strings attached.
I like the idea that you can decide, as a government, to speed up certain things or create incentives for economic or social action in certain region. But it should come at a cost, should it not? Otherwise it's just a freebie...