It would be great if you could add two features: sharing a recently achieved advancement with all party members and/or sharing it with allies. I've been looking for a mod that does this with minecraft teams but I couldnt find it.
Also, another feature Im thinking of right now would be able to link a minecraft team with a party or the other way around.

Either way, this is an incredible mod and Im sorry if this isnt the right place to post an idea or feedback

Thanks for the suggestion!
Sharing advancements isn't something that I would build into this mod. This mod is supposed to add parties and claims. Everything else can be handled by other mods that can interact with this one.
I don't want to touch vanilla teams either to avoid any conflicts with things that make use of those. And I don't like the idea of syncing different team systems in general.
I appreciate the feedback though!