I get your point about warfare being incredibly simplified in HoI4 v HoI3, however, I think that virtually everything else about HoI3 is borderline unplayable due to how many factors of high-level industrial economy it is trying to simulate. And I say it's unplayable, mainly because it's unreadable. I, as a new player, have no real way to figure out at a glance what effect any given action I take is going to have. And that makes it both harder to learn at all, and makes me not want to bother trying.