Trans to engine braces

I don't understand why you would leave them off. To each his own but Chrysler thought they should be on there.
They also put 2 exhaust braces on the driver side of the 273 exhaust manifold but not at the LA plant...so Chrysler west coast thought they shouldn't be there? I think thre was a thread here that asked whos car came with it and the opinion was that the rust belt cars got them and the west coast didnt.
1965-valiant-exhaust-manifold-brace-jpg.jpg