Progress for both sides of every campaign is tedious, while throwing everything into four nations totally spoils history accuracy and it’s unfair not including English or Italian troops in their own countries. Why not just keep those campaigns and replace progress with research trees within every campaign?
Here are two simple ideas:
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Same weapons in different campaigns will be unlocked once, but enough (less than a new weapon) previous weapon unlocks are still required in a certain campaign.
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For the first campaign of a new player, a 6/6 research progress is required for each tier and the ratio decreases (like 5/6 or 4/6) as the player finishes one campaign and starts another.
In this way we can keep the diversity and history accuracy of campaigns and decrease the cost of progressing in a new campaign. And that’s what a lot of people are looking forward to.
Anyway, this is just a rough idea. If the merger is bound to happen in the end, this still could serve as a transition plan.