With the 3 point system there are places in the curve that are either too much or not enough and you cant change it. If you do change it then it is wrong at another point. Helis are extremely persnickety and require just the right amounts of throttle and tail mix to keep from drifting sideways. You already have your hands full hovering, keeping the tail in line takes even more concentration. Its not like you cant flly with a 3 point but a 5 point makes it that much easier.

Vinces brother #1