There is no difference in cable stops or routing. High normal required the derailleur spring to do the difficult shift to larger rings, and never worked all that well.
Ah but grabbing the Low gear on a climb worked well .. As the OP shows, User Ignored scrapes cause wear..
The Engineers keep trying to dummy resistant derailleur systems , but there is always the willful type.
and having a scheme go awry dropping the bike on the right side.