What kind of diplomacy would you like in Manor Lords?
What kind? We don't have any yet, but it is clearly gonna come eventually. Allying with other AI to fight off the Baron together? Trading goods with other AI towns/villages?
Also, the entire map is one Barony, so how does it make sense that there are up to four (including your own) independent towns? I'm not too versed on medieval law, but baronies were usually ruled by one person, not a bunch of independent villages, each with a title to a subsection of the barony. Idk. Guess it is a gameplay compromise.