The argument of potential advantage doesn't really hold water as far as I'm concerned.
For instance, going back to shoot lanes 1 and 2 gives you no more advantage than someone would have had if they'd started on lane 1. Also you could argue that a person starting on lane 1 would have the advantage over someone starting on lane 2 because the person on lane 2 has to walk the entire length of the course before shooting lane 1 and this will increase their heart rate.
It's swings and roundabouts, but at the end of the day we do this for fun - it's not the Olympics or anything and there's no money at stake at the end of it.
I've watched some very well known AA grade shooters shoot lane 1 when they started on lane 2, to save themselves a long walk back at the end of the shoot. This was in a couple of BFTA Grand Prix this season - yes technically it's against the rules, but I don't have a problem with it and I'm sure they gained no real advantage over anyone else as a result.