In CK3 you are literally guaranteed the world.
In CK2 you had to have patience, if you did you would still be punched in the gut and thrown aside by a mightier foe, a disease, or even yourself if you we're dumb enough, but even then you were never guaranteed anything.
In CK3 you literally know when ANYTHING will happen, CK2 you don't most times.
You are guaranteed claims on land you are guaranteed to raise development you are guaranteed to convert counties, etc ad infinitum.
If I can see everything going on in my kingdom down to the littlest bit of knowledge then what is the point.
CK2 is a King Simulator.
CK3 is an all knowing god controlling a character simulator.

If you have any real experience with CK2, not this 20-50 pump and dump ♥♥♥♥, and you buy this and somehow enjoy it, you are an absolute disgrace and should be ashamed of yourself for both buying it for $50+ and liking this watered down, hand holding, trash heap of a game PERIOD.