What worries me:
- Governments from Eu: Rome work mostly the same. There is strict, clear division between Republics and monarchies. Republics have senate, monarchies court. It shouldn't be the case, government should be more customizable. Some monarchies of the era still had senate or other kinds of popular assembly. I would like for them to exist in game next to court. Even without much power it would be good for flavor to be able to observe factions in the senate. I remember my disappointment when I established dictatorship followed by Empire in Eu:Rome and Senate just vanished replaced with court. It's completly immersion breaking, senate still existed during disctatorships and Empire. Rome was transformed into monarchy while keeping appearances of the Republic after all, August was smart enough to not call himself a king, he was defender of the Republic.
- Disloyal generals and governors of your culture will only seek civil war not independence. I think that ambitious characters, even of ruling culture, should be able to try establish their own separate state. That should also be a possibility during a prolonged stalemate during civil war when rebels control whole region but they didn't manage to take capital.
- So far I saw that characters don't have place of birth in information window or button to open character history. I loved those features in Eu: Rome.
- I don't know if cursus honorum will be in game as it was in Eu:Rome. In Eu: Rome also every character that held some position in the past had special trait like "former ruler" "former censor" etc. I didn't see that.
- Spending power points to support faction in the senate or reduce war exhaustion - I don't like things like that. One shouldn't be able to turn a river around with just a few magic clicks.
- Divinations are no longer real divinations where result may be bad. They are just bonus you buy from time to time. I liked the gambling aspect of divinations in Eu:Rome, it made sense. Making them always be succesfull is immersion breaking and boring.
-I only saw an diplomatic option "marry to the ruler". So far it looks like we won't have control over marriages of other members of ruling family. That would be really strange and immersion breaking.
- If I understood correctly to make families more significant their number will be somehow limited, I hope it's soft cap that can be exceeded when we for example conquer another nation.
- You can manually set governors policy without incurring tyranny - Dealing with unruly governor would be fun, especially in republics where senate could nor agree on governor's dismissal.
- Military traditions - I think that there should be something else in their place. Usually in games with national ideas players quickly discover best combinations and always take them. For example morale bonus is no brainer. But I don't have counterproposal so it's just a minor issue.
-Forts are blocking paths like in EU. It's of course better than old system where fortresses had no significance but I would prefer a solution where you can still choose to march above the fort and leave it behind but doing so would have severe consequences like no reinforcements and doubled attriction.
if i may add some thoughts
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Disloyal generals and governors. In civil wars I would add some penalties that really screws the social balance so that you do care if a civil war triggers and the actual result of it (increase the revolt risk for affected pops by region or alligiance, automatic political prosecution-enprisonment-exile-assasination of losing characters that you may find useful, families vendetas, stability hits,...). Usually in EU I do not care much because it has not much political or gameplay consecuences, the country moves on very quickly and the war is never very challenging.
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characters don't have place of birth in information. Interesting
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cursus honorum. I would like to see cursus honorum affecting greatly what a character do and what can be elected to. no teenager generals please. Also put something on the portrait where I can see his level so that I can understand at a glance what offices can he access and making him a threat to other families if his stats are better that their members' candidates (ie. a youngster from another family with more charisma than an appointed governor member)
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Divinations. I want to see politics in omens. populist pigs do not support other factions' politics

. I mean, if you choose a pontifex that hates the consul, or from a faction that opposes the consul's prepare to find a twisted liver in that pig. Moreover, if would be nice that pontifex office or any other is not completely chosen by the player but in some cases (you may not have the "political capital") other factions may overrule the candidate preferred by the player. This, or some other mechanic alike that if your mana points (civic?) are not enough the state will start to behave more organically.
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limited number of families. I do not have a problem necessarily with the number of them but their possible passiveness. I would like to see them competing with the player to take control of offices, generals, governors. Also, I want to see clearly in the interface what are the families' objectives, alligiances, who they want to assasinate, what wars they want to start or to end, games or buidings they want to pay for to increase their popularity/influence... I am quite happy to see the new family interface but I think Paradox has a very good opportunity to really make the game feel like a different "animal" and not just a reboot of EU. I think this can be achieved with a dedicated interface to each family stating their ambitions, resources they have, their connections, their offices or regions of influence and your available interactions. I think that would give a better taste of what politics is about, dealing with groups that you do not fully control and have their own initiatives.