I was educated and into games for a good few years, graphics and physics before I won some money. I am not qualified.
Perhaps you can share a Unity game of similar scope that is not 2d, 2.5d, or 3d plane? These games are fine. Unity is a great choice in fact.
But KSP is pretty vast, it's uniqueness makes it difficult to compare to other things.
Anyway guys, I just want to iterate that this is all my view, anything I say isn't going to change the choices that have been made. I am just saddened and maybe it is unfounded. I lack the faith is all.