Continuity is good, but it is tunnel vision to see it as the singular overriding priority of fiction. It is one tool in the kit, and there are other things that are often more important.
Besides, no creation is perfect, and people have the right to try to improve their creations as they go. That's how creation happens in the first place, through trial and error and refinement. There's always more room for improvement; as the saying goes, "Art is never finished, only abandoned." All creators would like to continue refining and improving their work after they're forced to release it, and you can find many instances of creators (myself included) making further revisions and corrections in their work when they have the opportunity to re-release it. It is blind, if not outright cruel, to say that creators should be denied the right to continue striving to improve their work.