When it comes to computers making calculations in rockets, or why a flight simulator is simulating a flat earth, that can easily be explained. The numbers are so huge that for all intents and purposes its just easier to calculate it without all the extra resources when the end results are just as good.

It's funny in a way how were using the military's physics to disprove round earth, when its these basic laws of physics that allow rockets to fly to where they need to go.

Shooting a hellfire missile is nothing like shooting a inter continental missile.

https://www.popularmechanics.com/military/weapons/a28126/hard-to-build-icbm/