At first I thought it was useless: "but each ISA will still end up having different effective syntax because the underlying macro systems will not be designed t

At first I thought it was useless: "but each ISA will still end up having different effective syntax because the underlying macro systems will not be designed the same". But then I reread it and realised I was not paying attention to the usecase. It's about making it easy to write assemblers. So this isn't for your Arms and RISC-Vs it's for your random niche microcontrollers where the vendor-provided toolchain kinda sucks. Seems cool! I've experienced a couple of under-documented assemblers in my time. In neither case did this turn out to be that much of a problem in practice, but I guess I just don't write that much assembly.