I don't think there's any point where the writer needs to restrain self-indulgence in fanfic. There is, however, a (highly variable) point where the reader will give up reading any given fanfic if the author has disappeared off into their own little world.
There's probably a reasonably high level of wish fulfillment and personal perspectives that can be found in any fanfic. Reading stuff written by anybody I know at all well, I can often pick out stuff that says something about the author. (*Includes self in this*)
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I don't think there's any point where the writer needs to restrain self-indulgence in fanfic. There is, however, a (highly variable) point where the reader will give up reading any given fanfic if the author has disappeared off into their own little world.
There's probably a reasonably high level of wish fulfillment and personal perspectives that can be found in any fanfic. Reading stuff written by anybody I know at all well, I can often pick out stuff that says something about the author. (*Includes self in this*)