The history should be accurate, and as complete as possible.

But the history should include the myth, its origins, and when and how it came to be associated with that particular history, and the relationship of that association with other uses of that (and the most similar other) myths.

One can recite dates and numbers; but one cannot understand the history without also knowing the lore, myth, and superstitions of those who made it (and of the - usually - others who wrote it).

But it sort of spoils the act if one attempts to include it all in each and every performance.

John