Yeah, having recently done a nostalgia-playthrough of Hoi 3, I do not miss having to keep track of dozens of HQ units and make sure they're all positioned properly to give their bonuses.
The thing is that we could have HQs but without them being physical micro-management nightmares in HOI4. For example if zooming out grouped divisions (as currently) but to army-level instead. Click the grouped army icon and you'd get all the divisions under it. This could be done for other features as well. State-level suppression, logistics etc without on-map units shuffling about on lower zoom-levels etc.
You could even have attachments to the HQs with modifiers etc and all without the hassle of having to manually move stuff around. With that kind of approach a OOB from corps-army group wouldn't even be an issue. It would even serve to simplify for those who don't want to bother with micro even further as you could just play on army/corps level ala HOI2 if you wanted.
I'm also quite confident that it would serve as a possible hook for AI handling as well. Tiered algorithms with shorter individual fronts and AI considerations made on smaller level first and then Army/Armygroup AI logic handling said armies as single units as far as AI considerations go (at least easier to optimize).
We already know the AI is pretty adapt at handling small fronts with few units, it's when you get large or deep fronts with many divisions that the madness starts. Tiering the decision-making could be one solution but would require something like a OOB mechanic to base it on.
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