Lord knows that's how it works with pretty much every other long-running fictional enterprise. I don't expect every Tarzan or Dracula or Batman or Godzilla movie to fit together into a single seamless whole. Nor does it ruin my enjoyment if the Brendan Fraser MUMMY movies are not 100% consistent with the original Karloff movie (or the Lon Chaney movies or the Hammer Films remake). A certain degree of continuity can be enjoyable, but preserving the sacred "canon" should never be the be-all and end-all. To put it another way, a good STAR TREK story is still a good STAR TREK story, regardless of what timeline it's set in. Just like a good ZORRO movie is a good ZORRO movie, regardless if it's "canon" or not.