I think there’s a lot of canon (if you’re a canon fan) already out there to support the idea that Spock was more emotional when he was younger – the character’s portrayal in the original pilot (which became canon when it became part of “The Menagerie”) and his portrayal in the second pilot both point to him being more outwardly emotional. When I think of the Spock character in the series versus the movies, I get the impression that the older Spock in the movies was more at peace with himself, whereas even in the later TOS episodes, the feeling you get from the character is that he’s, well, a bit sharper and more tense (most of the time), indicating that more is happening under the surface. When you’re still trying to find your place in the universe, a journey younger Spock needs to go through due to the conflicts inherent in his mixed heritage and his father’s disapproval, I would think that would make him more emotional, and I suspect the changes resulting from the transition to the young, fiery Kirk from the older and burnt-out (by his own admission) Pike would be unsettling (a bit like when you start a new job). It makes sense then that Spock will be more emotional than we saw him at other times.

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