For the uninitiated in AArch64, are there specific parts of it you're referring to here? Mostly what I find is that it lets you stitch common instruction combin

For the uninitiated in AArch64, are there specific parts of it you're referring to here? Mostly what I find is that it lets you stitch common instruction combinations together, like shift + add and fancier adressing. Since the whole point of RISC-V was a RISC instruction set, these things are superfluous.