I've been thinking about it for a while now and I've come to this:
I still think the general idea of the system is great and desperately needed. Eliminate movement micro that suggests tactical depth where there is none, move towards a system where fronts matter, and turn warfare into a matter of economics and shaping the military as a national institution.
I would concede this: if we're supposed to consider warfare on the level of our nation rather than on the micro-level, we need more options to actually define the nature of our military on that level.
I've explained my ideas in more detail in
this thread, but will try to sum them up here.
I think what we need is: HoI4, but you only get a single division template, you don't get any units on the ground moving, and you only get the automatically executed battle plan. But have the equipment provision, have the army organization, and have the staff of generals.
Basically, let me define the nature of the military as a whole; let me define the nature of a particular army; let me broadly define what it does.
Defining the military as a whole: More production methods for armies, including different weapon types, rather than just having those technologies unlock better production in weapon factories. Give us supply as an extension of economics. A system for building a stockpile of equipment (separate from the stockpile-less market) that consumes trade goods and produces the stockpile, and then having to use it to provide for the troops.
A law/institution representing Army Doctrine. Maybe Military Academies, improving the quality of your generals.
Defining the particular army: let us chose which units to assign - whether to make a army with only conscripts, or one with all the barracks using one particular production method; and also whether to fill the capacity the general has or take less than it. Then have Field Marshals leading multiple generals - this would actually reduce micro further, because right now, you still might have to assign a dozen generals to this front or that front rather than being able to say "three armies under that Field Marshal to that one". Introduce veterancy, where armies that have been fighting gain experience, becoming more capable as they fight wars, and lose experience over time when at peace.
Defining what it does: maybe eliminate fronts entirely, apart from visually. Just give us the strategic region (might have to readjust the sizes) and we assign an army, telling it to either attack or defend.
Then add onto that by integrating it with the other systems. During an uprising, one of your well equipped armies veteran could defect along with its general.
To facilitate that, Battalions would probably needed to be somewhat separated from being a purely localized production though.