And the counter argument is also obvious (not to yours, but to the original statement): If it is inevitable, let evolution create it without interference.
As for the ending... I have never played the game before the Extended Cut, as I have said before, but I am not overly annoyed. It is not good, but it is not bile.
In fact my single biggest complaint is the decision to auto-load the auto-save before attacking the second to last enemy base, instead of stopping the game and asking if the player wants to quit or start over. It actually took N5 seconds before realizing it wasn't some after-the-ending thing going on.