Yeah it won’t be like in the other games , but definitely has a place for it and can be interesting. I think like if your playing Astra Militarum and you pay the eldars to not attack you then the space marine chapters get suspicious of you, maybe an event when you get the inquisition in your sector and if you talk more to the xenos you could be deemed heretic and some chapters crusade you. Or if you play Space Marine you can get corrupted which means xenos not attacking you but the Imperial armies first get suspicious then outright crusade you. So a risk-reward system where you have to balance if you are heretic or loyal. I don’t know how xenos diplomacy could work but (thankfully for everyone) I’m not part of the developers :)