For YOU it was unnatural. For ME it feels unnatural to be in some sort of modified yoga ball whilst riding a motorcycle. FWIW, I'm 6'2, and on the 2013 electra glide/road glide/road king my legs are bent at about 90-95°, with my knees and hips about level.
The fat boy low, however, is more stretched out, but not as much as the Dyna fat Bob, which is, IMO, the most comfortable bike I've ever ridden.
Because so much is riding on your tires.