Nimoy explains in a video that in the beginning, during the Cage, the idea of Vulcans and their adherence to pure logic had not yet come about, it wasn't until later when they recast the crew and did a new pilot, that the idea of pure logic came into being as a Vulcanian trait.
This could almost be overlooked except for the few instances of Nimoy's early portrayal that he felt ultimately wasn't superior and better to present the character. indeed much of Spock's drama came from his battle to adhere to logic over emotion, and this made the character tragic and heroic and intriguing all at once. To remove that for the sake of fan wank, and explain his 25% difference due to the Cage, is stretching the credulity of informed reason and belief. I think that having the character have been more like Spock post pilot, would have kept the unmentioned pass the collective fandom gave to it. It did not need a story and justification for changing the character's personality and built on a flimsy foundation at best.
The Vulcan Back story, and their history should be more important. That tradition of logic is based on how brutal their race could be with unbridled emotion almost destroying themselves in the process, this would be a core tenant for Vulcans, almost akin to the collective psyche in all anime who reference the atom bomb mushroom cloud. It is a collective consciousness type deal, as well as actual history. It is missing in the emotional portrayal of Spock, especially someone raised as a traditional vulcan.
