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Tbf If a hit was strong enough to break the frame, then I don't think a flimsy hanger would save it. There is videos of people jumping up and down on the new mech and it's not even bending. Introducing a flimsy bit of metal between frame and mech would only be introducing a weak point.
*I'm not a SRAM engineer, and I can't vouch for authentication of said videos. But if they're to be believed, then the mech hanger is not needed.
I'm glad I don't have to convince you lot in change and innovation in my industry :-)
I think having the expensive dangly bit that's somewhat likely to take a hit when you fall off attached to the expensive framey bit via a cheaper sacrificial bit of metal is a pretty innovative idea from a not spending unnecessary money on broken frames and derailleurs point of view, especially when the parts are often not just expensive but out of stock.