The strutting may be a factor, but on most guitars the bridge is compensated: stringing it the other way round makes it impossible to tune. When I have a left handed pupil I ask them to play right handed for a fortnight with a loaned guitar before making a decision. In most cases where the student has never played before the adaptation is rapid, and as said above I agree that lefties make more rapid progress.

My wife agrees - she is very LH and plays RH very well.

Stu