Although I personally believe in the broad concept of "Personal Canon"/Fanon, there IS a point when said concept becomes a 'crutch' that can't be justified, particularly if/when it runs entirely contrary to both factual evidence AND logic.
I agree to some point. Well, I wouldn't go so far as calling it a crutch, it's all in fun, and how would it be a crutch? but yeah there are some things that are irreconcilable. Can you give me an example of where a personal continuity runs contrary to logic?