With brining all the new civilizations to DE the old civilizations are really underperforming except those which were top tier on the legacy such as French, Portuguese, Japanese, Spanish, Chinese.
Not saying that the new civilizations are bad but saying old civilizations need a rework (new cards or new mechanics) to be able to compete with the current treaty meta. Gonna list some example of the current issues with the old civilizations.
Decent economy but lacks skirm, slow artillery training, rockets could really use a nice buff because they don’t seem to do much now. I love the rockets but every time I use the they make me lose my push. Chinese flying crows are similar option but much more effective.
Decent economy BUT lack of population and not effective units. You get 99 villagers + 23 settler wagons clearly the economy looks amazing but your units are not effective enough. Imperial Uhlans very low Hp, Imperial Skirmishers not that efficient compared to other Skirmishers in the game at the moment, warwagons very pop heavy basically 3 pop for an anti cavalry which has mele resistance is just too much, Doppelsoldner are 2 pop as well so basically your whole civilzation is stacked with bunch of heavy population units which are not really effective. The only good point about Germany is the 1 infinite Heavy cannon shipment which AGAIN 4 uhlan (8 pop) + 1 heavy cannon (7 pop) = 15 population when you send the card. Basically your only chance of winning a treaty game with the current meta with Germany is camping and most of the time enemy will just run over you because of lack of population. You can delete villagers of course but economy will drop at the same time as well. Main point is the efficiency of the units. The church card of Germany is one of the worst cards in treaty, not competitive at all. German mercenaries don’t get enough buff (not even close to Swedish mercenaries) just because you only have 1 card that boost their combat by 20% and yet you can only train them from saloon.
Again just like Germany, economy is decent but units are not effective. Lack of training speed on Abusgun and the fact that only Janissaries are your 1 pop unit is just frustrating, clearly you can vil delete and try to push but then again, against top tier civilizations you have no chance of winning. Abusguns were nerfed super hard on DE because of supremacy but clearly there is the solution for it. Other thing, your only infantry is Janissary inside the barracks so basically the variety of infantry/1pop units is just there. Nizams are good shipments but then again only can be sent from homecity, I don’t get it why a unit like Neftenya can be there with no limit with range and siege resistance and high HP and attack while Nizams can’t be in barracks, maybe just change nizams to rifle infantry then that should fix it. Again there are bunch of solution for this but will make this super long. So I won’t go in detail.
The second worse civilization in treaty, lacks proper artillery, siege elephants can be countered by every single unit in the game just because of their unit tags. You could get falcons and bombards from consulate but cost export and getting export is not easy plus they no arsenal upgrades so basically they are nothing. Infantry training is awful, proper cavalry is not there, camels are awful even though they have 2 cards but then their HP is not really ideal even with mansabdar units, elephants are super expensive and super pop heavy. Economy is fine.
The worse civilization in the game, lack of anti artillery and super weak units with the explorer that only boost kill XP, stacking the gold shipment is fine but then units are not even cost effective, why arrow knights and huaracas don’t get siege resistance and yet neftenya get siege resistance? So basically 3-4 horse artillery can wreck Huaraca and Arrow Knight in general. Defending against Cayote is super easy because of low stats and slow training. Best and most useful unit that they have is Eagle Runner Knight which trains slow, other units are rather bad. Ottontin slingers are worse than Strelets. Economy is fine but units are awful. The recent adjustments on the Aztecs was kinda bad, they felt better with stronger Jaguar Knights (even though they were more expensive as well)
Your best way to play with them is split fights and runs basically in a headsup1v1 they make the worse trades because of super weak units.
There are more stuff about civilizations in treaty but then I guess this will be a good start to adjust the treaty balance/updates.