The whole old Spock contrived bit of continuity management annoys me to no end though.
It would be like Casino Royale, if Casino Royale had felt the need to explain why Bond was going on his first mission in modern times, when he has been a kickass spy since the 50s. It was a reboot, didn't need to be explained. We knew we were starting over from scratch, back at the beginning, none of that stuff from the other films has ever happened.
I was excited back when I thought it was a straight up reboot, but this whole alternate timeline bit is dumb, and makes more problems than it fixes.
Imagine this scene at the beginning of Casino Royale.
Pierce Brosnan as Bond: What do you have for me this time R?
John Cleese as R: For you next mission 007, we will be sending you back in time to re complete your for mission for... (insert long winded and contrived reason here) ...the only catch 007 is that you will not be able to return to this time.
Bond: You're joking! Your sending me back to the 1950's to re complete my first mission as a 00 at the Casino Royale? What about the young version of me? Won't I just get in his way?
R: Well here's the thing 007, you WILL be the young you, and you wont be in the 1950's, it'll be now... it is complicated, don't make me explain, just do you job, will you?
Brosnan Bond steps through glowing portal and comes out the other end as Daniel Craig. Bond theme plays loudly in background.