We really can't see that far ahead yet, sorry... I would say a frontline system is most likely too big of a challenge, maybe for anyone. However, new units with larger unit counts is a given, also we can play with modifiers so that it requires a different type of army management from the player. We would like to do this in some form. Also, my guess is that by the time we get there, Paradox changes things as well, so we'll see about those too.

How will you tackle the challenges of modern warfare within the structure of EU5? Would you be able to introduce a frontline system or you are going to rely on the army system from the vanilla game ?

Oh this looks so promising! Thank you for your work!