Splitting, joining, reporting, regex "groups" that can be run sequentially. Clearly if you don't need anything like that, it still won't convince you, but it offers -- under one roof -- that which otherwise may require multiple apps to achieve. Not to mention that many platforms' included zip utilities are simply incapable of properly creating a valid epub container. Flightcrew provides error checking for when your eyes just can't find the error.
You're right that it doesn't do anything I couldn't do myself with other apps/tools... but it sure does a hell of a lot of things I don't want to have to do by hand (or run through seven different editors to achieve).
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