The Wormhole wrote:
Canon is what makes Star Trek Star Trek.
That is all...
Star Trek tossed canon in episode 3 of TOS (I think) when Spock's human ancester became his mom and they have never looked back. There has been too much time travel in Trek and time travel seems to always change history, even just a bit.
For me canon is like history. It's there, it's official, and it is loosely based on fact. If you read history books as compiled by various countries you may wonder how things get so wrong. At that point you can either enjoy what you watch and read, or you can drive yourself crazy picking out all the discrepancies.
Sometimes I think Star Trek canon has been the biggest myth in fiction.