t claims to eliminate locality/unitarity seems decidedly odd to my mostly-untrained mind.
The article is confusing on this point. IIUC, the amplituhedron does not eliminate either unitarity or locality. What it does is to avoid taking them as axioms, as the Feynman approach does. Then it later turns out that they fall naturally out of the math, which is much nicer.
I figured as much. That still seems mildly odd, but that's probably because I'm used to thinking of them as axiom-ish principles and not as derivative results.
I recently ran across a rather interesting result while browsing the Internet:
Physics Discover Geometry Underlying Particle Physics
Unfortunately, I'm still at the point in my education where my best response to new physics is "cache for later," and the fact that it claims to eliminate locality/unitarity seems decidedly odd to my mostly-untrained mind. I notice I am confused, and that LessWrong has a rather large number of trained physicists.