Topic on User talk:NotaBene
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Most page moves should leave behind a redirect (if we're moving a work or trope to a new name); this was a corner case where I was moving a subpage to be a subpage of another work (COPS the reality TV show vs. COPS the cartoon), and having a redirect would have been inappropriate.
If a page gets moved without a redirect (when it should have a redirect), and breaks a bunch of links, we can just make the redirect afterwards, but I have seen a wiki vandalized by a confirmed user spamming page moves (without leaving redirects) and scrambling up their histories in the process. (In the end, after he was blocked, we rolled back to a previous backup and 'lost' the week prior to the attack.)