I think Henry Baker argued otherwise saying that at the circuit level a stack processor can be designed to operate faster (like shorter path, less clock cycles) compared to register ones.
Stack machines made more sense when memory was limited (small opcodes) and there were no hardware multiplies, but these days they make no sense.
I don't understand all the vague nostalgia for something that never could have panned out outside of the creaky old Apollo flight computer or something.