In HOI3 the difficulty changed just about everything, from how units performed in combat to industrial capacity. Personally I would prefer if non-combat stuff was two settings, one for player nations and one for ai, and two for combat stuff, one for player nations and one for ai.
Since the easier difficulties have a very important role in bridging between tutorial and regular play, having a universal difficulty makes it much harder to identify good or bad behavior, since it teaches the player to overvalue his/her capacity in tactical situations. In the 1944 d-day bookmark, on very easy you just had to say "charge!" and you would win the western front as Germany.
It could also encourage playing on harder difficulties since the AI wouldn't get battle-winning discipline outta nowhere, while still giving them the extra factories to compensate for their sub-optimal allocation of resources on a strategic level. Or you could do the opposite. If nothing else it hopefully isn't that much work to implement, while giving more freedom, more control and more customization.
Since the easier difficulties have a very important role in bridging between tutorial and regular play, having a universal difficulty makes it much harder to identify good or bad behavior, since it teaches the player to overvalue his/her capacity in tactical situations. In the 1944 d-day bookmark, on very easy you just had to say "charge!" and you would win the western front as Germany.
It could also encourage playing on harder difficulties since the AI wouldn't get battle-winning discipline outta nowhere, while still giving them the extra factories to compensate for their sub-optimal allocation of resources on a strategic level. Or you could do the opposite. If nothing else it hopefully isn't that much work to implement, while giving more freedom, more control and more customization.
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