I can understand why some archers prefer a tall sight window. These guys typically have a low anchor point and shoot longer distances.
Personally i like about 2.5" of vertical, then a radius back out to full bow width, with an 1/8th - 3/16" past center...... Why? because i use the whole site window in my view of the target much like a peep site for my aiming method. I adjust the spot i'm concentrating on up or down in the whole site window to adjust from 15 to 45 yards.
With a really tall sight window it throws off my peep site system BIG time, and i have to use a gap method.