Consider this a reminder for people currently watching Star Trek, old and new.
Logic and controlled emotion aren’t inherent to being a Vulcan. Somehow gaining Vulcan traits, or biologically transforming into a Vulcan, will not make you logical and emotionless. In fact, quite the opposite would happen.
Vulcans used to be warlike, barbaric (as Spock would describe them) and nearly wiped themselves out. It was the teaching of Surak in the philosophy of pure logic, after centuries of war, that made Vulcans what they are today. Vulcans do this by training logic and emotional control throughout their childhood and teenage years. Ultimately culminating in Kolinahr, the final stage to “purge emotion”. But Vulcans still experience emotion, and their state of control is something that requires constant maintenance through meditation and practice.
Vulcans are far more emotional and passionate than even Humans. If a Human so much as houses a portion of a Vulcan’s Katra (the mind/spirit), said Human would struggle immensely to keep their feeling under control.
I’m writing all this because I’m getting the feeling that this very important part about Vulcans is being forgotten (perhaps more-so by the current writers of Star Trek).
Spock himself explicitly states as much. I forget the episode, and I’m not having luck searching for quotes, but good ol’ Leonard Nimoy straight up says, (paraphrasing from memory because I can’t find the exact quote) “… quite the contrary. Vulcans feel emotion, stronger than humans. They must be repressed and controlled lest they become overpowering.” or such similar direct statements.
It doesn’t explicitly jive with some of the other writing for the character, where he outright says things like, “I am incapable of that emotion”, or otherwise acts like a stone wall in some scenes. Though he’s not written so poorly that it’s impossible to reconcile, either. Pretty easy to assume he’s simply on top of his emotions in those scenes and doesn’t want to give in nor wants to explain.