I for one don't understand why they altered TOS.
Heck, I'll go a step further. I don't know why they REMADE TOS for the big screen this summer. I liked the original handling of characters, relationships and origins much better.
They didn't "REMAKE TOS" this summer.
I don't recall any episode having this plot.
Now, if you had said they REMADE "The Changeling" in 1979 for the big screen, you might have had a point...