Be careful, we dont want players to have to read more than 2 lines of dialogue, or having to click more than 2 times in an interaction! That would be a heavy RPG which we do not want in this BattleSimulatorTM. I also miss from Warband dialogue:
Resolving disputes between feuding lords.
Talking with a lord to improve both of your standings in the realm.
Convincing lords to vote for you in the marshal or fief elections (this could be done for policy votes in BL, if TW ever listened)
Giving directions where to attack, defend, or follow
Asking for their political opinion
etc.
From the game files BL's system was much more deep. Lords had personal rivalries and ambitions, and wanted to improve theirs and their family's standing in the kingdom. I do not know where all that went. Too complex?