I've seen some pretty steep drop-offs on the outside of fast off-camber sweepers...I'll take symmetrical if it pays off with balance at the margins! Haha!

I guess we just get used to what we do, however, I rarely straddle the front wheel, and in fact prefer to stand to the NDS, bend over to undo the front, then turn around to do the same on the rear, where the brake release and skewer are together right there at hand again.