I read it here that Spock would not have become as iconic as he did, should he have displayed "humanness" in TOS, as he did in ST. I posit that he displayed a remarkably human personality in TOS.
Consider:
1. All those times he became visibly annoyed at Bones or Kirk.
2. The end of Requiem for Methuselah.
3. Spock's reaction to Kirk surviving their duel.
Contrast with:
1. Tuvok. The man did show some emotion, as most Vulcans would, such as apprehension, gratitude and annoyance. However, Tuvok was far more Vulcan than Spock, and his performance is not as cherished as Nimoy's.
Also see:
1. Sarek. The epitome of Vulcans. Remember how in "Sarek" he confessed that he loved Spock's mother? Or how he became upset with Kirk for letting Spock rot on Genesis? Marc Lenard gives the finest Vulcan performance in all Trek.
Thus, I feel that showing both sides of Spock's nature deepens the character.
Consider:
1. All those times he became visibly annoyed at Bones or Kirk.
2. The end of Requiem for Methuselah.
3. Spock's reaction to Kirk surviving their duel.
Contrast with:
1. Tuvok. The man did show some emotion, as most Vulcans would, such as apprehension, gratitude and annoyance. However, Tuvok was far more Vulcan than Spock, and his performance is not as cherished as Nimoy's.
Also see:
1. Sarek. The epitome of Vulcans. Remember how in "Sarek" he confessed that he loved Spock's mother? Or how he became upset with Kirk for letting Spock rot on Genesis? Marc Lenard gives the finest Vulcan performance in all Trek.
Thus, I feel that showing both sides of Spock's nature deepens the character.