the reason of laminar airfoils, is that the wing always has laminar flow over the all surface. the wing can fly faster, and at higher AoA and the flow will always stay laminar, or most of the time...

as the flow reaches high speed in the widest section, and the drag decreases the speed of the flow, causes it to separate itself from the wing, if the widest section is closer to the trailing edge, the turbulent flow that may appear, will stay little time over the surface of the wing

less drag ,less turbulence, and most important the wing generates more lift in all its surface

im sorry if my english is turbulent...

if anyone has other opinion, let us know!!