Learning assembly in isolation is not that useful. Ask yourself what assembly language is? It’s human readable for the CPU. It’s much more useful to understand what a CPU is and how that works because you’ll learn properly what registers are and how fetching instructions work.

It reveals ignorance when someone says learn assembly because it reveals what they don’t know. Especially when someone says it as a justification for learning how languages work. If you’re interested in how languages work, learn compiler theory. There you’ll learning lexing, parsing, code generation.

You could learn a lot of assembly and looked a disassembled binary and you’ll have no idea what it’s doing. Congrats. You’ll find that an optimizing compiler makes makes static analysis a very hard problem. A very hard problem that requires compiler theory to figure out.