Crusader Kings II

[komnenos]

I've noticed that at a certain point, Crown Authority just isn't worth raising. Medium seems to be the sweet spot unless you have a very stable and wealthy realm.

But I think it's better to raise your crown authority because most of the factions will be busy to lower this law. This will cause to make their faction goals busy and in this way you will forbidden them to think about other dangerous titles of their faction goal.
For example you'll see less factions about making elective system or put someone instead of you and so on.
So I prefer to always increase this law even if above medium.