Perhaps I'm
Once again, what does air stroking have to do with helping to align your head, body or anything else with whatever line you choose to talk about.
Air stroking is a recent phenomenon that's popped up which some find cool and others find absurd.
Whether it has any value in playing better pool is highly questionable at best.
Air stroking in the port arms position is not a recent phenomenon, unless I'm misunderstanding something.
Some things I have done/others do when air stroking:
1) Get the feel of the stroke hand grip before changing the cue's angle (in the full stance)
2) Rehearse the approximate speed and follow through of the upcoming stroke (plus you are rehearsing the shot mentally without the tightness/necessary compactness of the cue in the practice stroke, the CB impeding the practice follow through)
3) Set the bridge length with the bridge hand near or exactly where it will clasp the cue stick in the full stance
4) See if there is a sticky or slick spot on the cue stick to be wiped down before the shot
5) Use the cue to ensure the body is facing perpendicular to the line of centers between the CB/OB before bending to the final stance
6) It looks cool to air stroke, dudes! It's the equivalent of Air Guitar/Rock Band for pool!