Kipchaks carry Cumans like Mangudai Mongols. There are many times I win the game with Cumans only because of Kipchaks. Cheap units, fast producing and even without bonus damage to siege units, they do quite well against rams and tribuchets like Mangudai do. They don’t need any buff. They don’t do big damage but in mass just amazing.
Like every player, they play with Cumans, they go for Kipchaks, more than Knights and Paladin and that tells a lot.