Follower of the Way
The problem is, between complexity and simplicity, you have the sweet spot called "depth."Whichever side of the equation, reducing the number of variables makes it more solvable.
Personally, I would rather have complexity over a simple one size fits all numerical system. Personally, I think 5e makes the monsters too simple.
I would agree that 5e monsters are simple without being deep. I would not agree that 4e monsters are simple without being deep.