Au contraire: Flying Flapjack
Granted, it was WWII, and superseded by the jet age. However, the big advantage was that it only required something around 8 feet of "runway" to take off.
If you've seen the Dolittle Raid shows, the first (empty) B-25 to try a carrier takeoff had a wind speed of around 25kts before letting off the brakes, and nearly struck the carrier's island overhang as it suddenly became airborne much sooner than the pilot expected.
You haven't changed my mind. If it's such an advantageous shape how come we don't see modern planes with that design?
The Flying Wing concept goes back to 1907 and survives as the B-2 stealth bomber and several other modern jet aircraft. It looks a lot more like Arnold's historic UFOs too.