I don't really have any problems with mental models for the code I'm going to see on x64 (which does incorporate models of instruction scheduling, multiple issu

I don't really have any problems with mental models for the code I'm going to see on x64 (which does incorporate models of instruction scheduling, multiple issue, elimination (pretty easy), and vectorization, &c). Maybe it will come with more time on ARM; but three years in, it's still not there.