Reverts can be fun if what they're reverting to is something you normally see transformations into- a girl who turned herself into a guy turning back into a girl would be adorable. Of course, lots of sequences could be made an example of this just by changing the captions.
Mostly though, I think reverts help create a satisfying story. It frustrates me to no end that the majority of transformee characters neither want to be transformed nor find a way back. Reverts let a character reflect on what was enjoyable about the transformation without the clawing horror of having their identity wiped out. And that tends to lead to my most favorite kind of process: character development. Major bonus points if they voluntarily choose to transform back from time to time.
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