The circumstances in which the lane position is being discussed here, is one of the least important situations that I can think of.
Worry about lane position when you are moving, approaching an intersection, with traffic from other directions and behind you.
Worry about lane position when you are approaching a blind crest on a two-lane road. Pedestrians, in your lane or in the opposite lane, opposing traffic possibly over the center line, you can't see any of it.
Worry about lane position when you have to slow down for whatever reason and there is someone behind. But I would rather just get the maneuver over with quickly and get the heck out of the way, as opposed to making myself visible to whoever is behind. If I'm not there any more because I've already completed the turn or pulled off onto the breakdown lane or whatever, then it doesn't matter if the driver behind is yapping on the phone. I'm not there to hit any more.
Worry about lane position when you spot slipperiness in any of its many forms.
Sitting at a stop? Getting smoked from behind is likely the greatest risk. For that ... for visibility you want to be directly in front of that following driver's line of sight (i.e. LEFT side of lane) and for giving yourself an escape route (into cross traffic against a red light??) ... good luck with that. If there is a only a center line between the two directions on the road that you are on, then there is no barrier stopping a vehicle turning left from the cross street into the direction facing you, from cutting the corner and hitting you ... so don't move too far ahead, too close to the stop line. If there is a central reservation of some sort (and often, a pole with the traffic light on it) then this is not as much of a problem.
But compared to the million or so other things that can happen, first - this is a comparatively low risk because you are not moving, and second - if you are going to get smoked from behind, and you can't accelerate into cross traffic or between cars in front of you because you are at the front of the line - there is pretty much bugger all that you can do about it anyway.