I think the strong implication is that by TOS, Spock is intentionally strongly leaning into his Vulcanness, far more than most full Vulcans would, and never quite comes back from that; and it gets so ingrained over the years that when he starts openly accepting emotion & such again in his later movie years, he never really loses the “formality” that’s become natural to him.
I always thought Spock tried harder to be Vulcan because of his human half when he was younger.
Last edited: