Well, we can’t say it’s Pay to Win if several of the new civs actually have a low win ratio, (I’m talking about the Byzantines and Order of the Dragon), and not all of the content is necesarelly only civs: We have New Maps, a New Campaign, New Biomas, etc.
Also, It was not possible to know what was going to happen in Ranked until the DLC came out, and in any case unlike Leage of Legends, there is a balance and it is periodic.
What is happening is that the developers are implementing new mechanics and original civilizations with more freedom than when the game came out in 2021. This allows now to have civs like the Japanese with 13 unique units, or even a civ with a unit mechanic with more population (OotD), similar to the Starcraft “Protoss”.
Let’s remember that when the game came out, many civs only had little unique units (English 1, Mongols: 2), and even their number was limited by balance; (“The Chinese could only have 1 single dynasty unit at a time, so only 3 per party.”)
Now, since the Mali came out in season 3, there was now a civ with 6 unique units at the same time and two cool passive bonuses. To balance it in the 4th season, many civs received new unique units (King, Wynguard, HuiHui Pao, Militia), unique technologies or balance of Landmarks.
Solutions: I think that in the future, just as happened with the Mali, the solution is not in nerfing new content, but in balancing the civs that, let’s say, “have been left behind.”
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The Byzantines could have an extra Feudal Age unit, aside from the mercenaries, to balance (Early Cataphract, Early Varangian Guard).
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The HRE could have more “Extra” Unique Units (that do not replace those of the classic build), such as, say, the “Black Rider” (ranged cavalry with giant gun). Some bonus could also be considered regarding the royal houses or states affiliated to the Empire at some point (Teutons, Bohemians, Castile), and if not recruit mercenary units from these “future civs” (Teuton Order Knight, Hussite War Wagon, Tercio Arquebusier)
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The French could have some extra technology or unique unit to differentiate themselves from the JoanDArc variant. They were also known for employing many specific mercenaries: Genoese Crossbowmen, Swiss Pikemen, and the Scots Guard.
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The Rus, to make the Landmark “Spasskaya Tower” more useful, could acquire the Oprichnik (from AoE III), light cavalry and raider anti-economic units and buildings, available in Keeps or stables.