I've been experiencing problems in building a federation, namely - I invited two members and nobody likes those members for some reason.

I really wish their was some diplomatic channel to force two empires to cooperate more closely such that the "dislike" tag goes away. Like hosting a Federation Summit for associated species, or creating a shared federation project and selecting your various partners.

Also, all federations are mostly the same, there's no complexity to how they operate. Like right now I have like 6-7 vassals, which, it would be cool to give them more partial autonomy within the federation (IE as sitting members with contributory fleet power). Because right now, if you release them, they don't auto-join your federation. In fact, if they hate the other federation members they won't join at all.

I like to play with like 10x the number of primitive nations, and then foster them with tech enlightenment into my vassals. But I also want to be able to treat them as federation members and release them after a certain time. And there should be some type of reward for releasing a vassal into the federation - like maybe a bunch of influence points based on the vassal size. And probably a diplo opinion boost with all other federation members/associates.

Also - federations should have Holy Roman Empire type mechanics, in terms of deciding on universal rules, government structures, leadership rotation mechanics (electors system?), etc. Right now it's more like a rotating military confederation with zero depth.

It just seems like there's so much room to grow.