Im not sure i understand, but I can tell you it felt good when one learned that setting the stack pointer and using push and pop was faster than using register

Im not sure i understand, but I can tell you it felt good when one learned that setting the stack pointer and using push and pop was faster than using register indirect addressing, bit twiddling to avoid multiplying or dividing, and fitting a mm/dd/yy on 14 bits. Constraints fuels a certain type of creativity. This is not absent today, but less frequent.