You almost had to, because both Z80 and x86 processors have a laughably small number of general purpose registers. To write code which works along that limitation would have required lots of care and cleverness, far more than on UltraSPARC and MC68000.

On MOS 6502 we used self-modifying code rather than the stack because it was more efficient and that CPU has no instruction and data caches, so they couldn't be corrupted or invalidated.