Sao folders . . .holes just look messy to me.
In a fixed blade: In many of his knives, Bob Loveless managed overall weight and its distribution with a tapered tang and distal taper to the blade.
In my view, holes are an elegant approach to weight management.
I generally don't like the way they look too.
A hefty fuller can also be effective and is more esthetically appealing than holes . . .to me any way.