Overall I think "The Apple" was a relatively crummy episode, and it has not aged well, making matters worse.
But, Celeste Yarnall. Therefore, your argument is invalid.
I kid, I kid (kinda). Yeah, the episode blows.
In all seriousness, it could have been so much better and still have kept the overall premise, I think.
The epilogue scene comparing Spock to Satan is really embarrassing too, I thought. Today, it plays as downright racist. Well, it does to me, anyway.