I am just about done with this unending line of Conquerors

The empire of Tartaria has become an absolute menace in this run. They are the only empire title in Asia, and have had 4 successive conquerors. They are eating the steppes for breakfast like Genghis Khan. I was excited when the current khan died randomly while hunting... until his 16 year old daughter immediately became a conqueror and took the throne.

What is the point of this mechanic? Feels like all it does is ensure one or two empires blob up the entire map.