How is CK2 random? Bigger size wins nearly every since time. That's my issue with CK2: it's way too predictable. Got a larger army? Enjoy your victory, sir.
A funny part of randomness is that adding more randomness actually makes it less random and more predictable. This is why you can't predict a coin flip, but if you flip a coin 1000 times you can sort of expect what you'll get. CK2 is the same way. You can say it's more random or less random and be arguably correct.