That was a brilliant ending. Really the last few episodes have had so much logic that seemed inevitable just as it unfolded. I predicted quite a bit of the final act, but that felt right.
For me this ending with its coalescence of several seasons' emotional heft in such a dense, rich, torrid finale that felt fully plausible, almost as if nothing was a twist … that was great writing. The writing probably eclipses the big shows of the "prestige" era with that cohesion—perhaps not MAD MEN, but it's way, way ahead of THE SOPRANOS or BREAKING BAD.
QuincyAbeyie some think we needed a scene before to sell Shiv changing her mind. She made the logical choice.
I didn't read her as making that choice based on logic. She was sitting in the meeting and the emotional impact of letting Ken have CEO hit her, and she couldn't do it. "You wouldn't be good at it" comes after, and is true, and is absolutely substantiated by the fracas that follows. But if you insert a scene to "motivate" her change of heart, you remove the truth: her motive is always having been second, always having to listen to "I'm the eldest boy!". And then the ghost of her unborn child, Logan's grandchild, the true "successor" for whom the violence of being born into such a family grimly awaits, brings it all home.
There will be so much said about it anyway, there was such a wealth of callbacks to every torment there's been in the whole show in that episode, but damn …