Mainly familiarity I'd say. Realise that as early as ENIAC we've used accumulator-based ALU architecture, whereas the first Forth chips started coming out in th

Mainly familiarity I'd say. Realise that as early as ENIAC we've used accumulator-based ALU architecture, whereas the first Forth chips started coming out in the eighties. It's hard to overcome such momentum, even if the alternatives have some advantages. Vaguely related: https://users.ece.cmu.edu/~koopman/stack_computers/index.html https://users.ece.cmu.edu/~koopman/stack_computers/index.htm...