because the whole mathematics and calculation stuff is not the important part of sending someone to the moon they couldve easily done the calculations without computers either with pen and paper or with calculators, computers just make shit more convenient and digital tech today allows us to livestream a rocket launch including leo  what you actually need for a moon landing is crazy good engineering and willingness to spend a shitton of money on one-off rockets. and to be honest simple rocketry has not advanced that much since those days and i dont think it ever will. what you see now is advances in computerized control tech which allows stunts like landing boosters, etc. but doesnt mean there has been fundamental progress in the basic tech
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