I'm not even sure
Time of the Doctor is about the Doctor.
It starts out with the Richard Curtis-esque family Christmas romcom about Clara and her wacky boyfriend. (If you remember that the Doctor is completely naked in those scenes even though he doesn't appear that way to us, the viewers, that part of the episode plays like deleted scenes from
Notting Hill.) And then it becomes a story about Clara watching her best friend grow old and die, and she rails against that, ultimately finding a way to keep him from dying.
Yes, the Doctor destroys the Daleks, but that's become Clara, quite unintentionally, weaponized him when she talked to the crack in the wall about how important the Doctor was. The Doctor resigned himself to his fate; he's content to wither and die in that clock tower. Clara actively fought against that fate, and because she took action the Doctor is able to escape from Christmas Town. The regeneration scene, as lovely as it is, isn't earned by the Doctor. The Doctor takes Clara someplace where, ultimately, she's able to save the day.
Matt Smith's performance masks just how much his era of
Doctor Who isn't about him. I don't think he's a selfish actor by any means; he gave his costars the room to work, to shine. The energy he brought to the role, supporting though it was at times, hid just how much to the side he was. Capaldi is a lower key actor, and Jenna's energy filled that void, which made his Doctor look even more marginalized.