This is a war game isn’t it?
I'll reply to this because it's the only sentence in your post that isn't a sarcastic remark or otherwise unhelpful.
HOI4 is a grand strategy game, featuring production, research, diplomacy, and logistics -- so no, it's not a pure war game as such. It's a war game as much as War in the East and Battlefield, but it
also features things like research and production, diplomacy, and logistics to a much larger degree. They don't
have to be, Project Reality features as much logistics and base-building as it does fighting, but their formula works. You spawn close to the combat and spend most of the gameplay fighting.
The beauty of the Paradox games, as I see it, is that it's a sandbox that has so many play styles. The thing I often disliked in RTS games and games like Civ was how similar the different civs/factions were. In the Paradox games, you can play as pretty much
any nation that existed during the time frame. If you don't want to spend years building up your armies, don't. Play as Japan or Spain or Italy or some other nation that goes to war early. Every nation requires a different approach, and there's bound to be one that suits you.
Likewise, if you don't think waiting and preparing suits your play style, don't. Charge ahead and make do without that bonus. You will probably be able to build your forces around this strategy. In fact, I'd like to read an AAR by someone attempting this.
Not to mention that, of course, preparations before combat
is part of fighting a war. It's kinda like how Gran Turismo let you spend time buying and installing upgrades for your cars, and doing all kinds of tinkering to make them run faster and more effectively. Did that make GT any less of a racing game? Nope, it just took a different approach than, for example, Ridge Racer or Need for Speed.