I completely agree with you (except the part about persuading enemy lords)
Lack of diplomacy is ruining end game and makes the game pretty meaningless at this point.
I believe that since its in an EA state , Taleworlds will surely implement many diplomatic aspects but i dont really expect huge advancements.
At the otherside, modding community will work miracles and if i can make a prediction , in less than 1 month we will have some great mods toward this direction.
Regarding your suggestions , i countersign them:
-Trading rights trading agreements is a must!
-Alliances
-Peace treaties that really last so economies can recover
One of my favorite games ever is Knights of Honor.
I think that if M&B had the strategy options of KoH and the RPG/3rd Person that Bannerlord currently has, it would have been incredible,
