Let's not forget that the Boomerang by Rutan was Asymetrical and it
flew fine.

So why don't Cessna and Beech and Piper and the rest just saw off
some wing, decrease drag and go faster? Asymmetric airplanes look
asymmetric but are designed to be balanced. The Germans had a similar
setup during WWII but it wasn't terribly successful.
Removing anything--wings sections, control surfaces, or
anything else--from an airplane will render it dangerous and certainly
less than cooperative. Ask any WWII bomber pilot who had to limp home
(or couldn't even do that) with such things shot away.

Dan