Most Tour Caliber Players line up with their feet—and sometimes knees, hips, and shoulders as well—
Open.
Why?
Becuase the "
Hips-
then Hands-
then sightly Open Clubhead" sequence that about 99% of all good players have through the ball, allows for solid contact and most of all: No HOOKS!
An Open Stance, simply gives you a head start.
BUT!
That's not all!!
It also makes it easier for these players to NOT SWING TOO FAR TO THE RIGHT, the flaw that so many Top-Level golfers have, it is behind most of the many teaching fads on Tour.
Anyhoo, setting up open makes it easier to perform the three imperatives...
for some.