You know most of these CGs are mechanically reversable - and some models have the lever up and others the lever down. So I gotta think that it should be as personal as other things you can adjust on one's watch.
For example:
I wear watches as a scuba diver. [Not that I dive as constantly as I did once, the water's too bloody cold unless I am in the tropical islands
] But old habits die hard and frankly most dive nuances make sense to me .
1. I wear my watch on the right arm not the left. What this does is makes most watches DESTRO by design. An inside crown doesn't catch up on stuff. [Hence when I wear actual destros, I tend to wear them on the Left arm to get the same effect.] But, oddly, I destroy watches less if they are on my right for some reason? That is just a personal aside.
2. I reverse direction of the straps whenever I get a new watch. Always put my 'buckle' strap at 6:00, again this keeps all the loose bits of the strap on the inside or protected side of the arm.
So when it comes to the Crown Guard, as a tool watch, it would be logical to have the lever pointing down, regardless of "style". As a functional aspect the lever is less apt to catch and open if it is inward. I admit I tend to leave the reps where they are, but I used to dive with a Generic [tribute]Panerai case that I build up and had tested through a dive shop. It was a very practical dive watch and I did reverse the CG on it because I used to find the lever popped open when it was at the top, as it would snag on something somewhere along in the dive ...
I guess the whole point to this is, just because something comes off the shelf with say a stainless steel bracelet, putting the watch head on a NATO band doesn't make it any less a ... Rolex .. Panerai .. Timex ... we are allowed to tune and adjust our possesions to work for us.