I know KSP lead designer, they use Unity because of him, he is not a programmer, and knew only how to code more or less with Unity, that he learned on universit

I know KSP lead designer, they use Unity because of him, he is not a programmer, and knew only how to code more or less with Unity, that he learned on university ( I was student with him ), now they have professional coders, but kept Unity for legacy reasons ( that is: they already started on it, so keep it...)