Ok, have it your way ...
Here is tooltip from 5e ... quote me any part that say that darts automaticly reaim themselves so you allways hit your target no matter wich par of his body you were aiming at:

https://roll20.net/compendium/dnd5e/Magic%20Missile#content

I still dont understand why cant we change Race for our hirelings. frown
Lets us play Githyanki as racist as they trully are! frown