Why not? Much better than assembly. I believe that even today, a sound asynchronous stack design (much simpler, therefore with asynchronicity still being a viab

Why not? Much better than assembly. I believe that even today, a sound asynchronous stack design (much simpler, therefore with asynchronicity still being a viable option) would consume less joules per unit of computation than any current ARM/x86/RISC nonsense. (You don't actually have to program in the Forth machine code, it's just that it's still a good medium for many interesting high-level languages.)