Just curious.....how the heck can you climb/sprint out of the saddle when you're OOP.....???
Also, I learned the hard way when riding a quad with our sons, and forgetting how many sets of crankarms needed to get over speedbumps, that unless you're very careful, you can drag a crankarm if captain is horizontal while stoker is vertical.
Finally, if you're aggressively leaning thru a corner, the same issue arises. My observation is that the more aggressive/technical the riders, the less likely they'll be set up OOP.