However, the story of how Kirk and Spock became friends is the only interesting backstory to be told about any of the characters. Every single one of the other characters is superfluous and any brief appearances are just fanwank.
To be fair, I think McCoy is also an important character, both as part of the troika dynamic, and how he relates to Spock. The other
characters are pretty superfluous, I'll agree, and it remains to be seen how the film will handle them.
As far as Spock's birth is concerned... who knows? I don't think it was ever stated that he was a wholly natural birth. It's an interesting avenue to explore in theory, but I don't really see how it could relate to the plot of the film at all. Care to elaborate?