Isn't this every creator's dream, to have their vision realized down to the exact detail without having to put in any of the work?

Not necessarily. For many, the actual fun is in the creating: that the act of creating happens to also produce an actual work is only a nice bonus, and something that could be dispensed with.

If this seems counter-intuitive, consider e.g. the more story-focused variants of tabletop role-playing games, where the participants create a story together: but the story is almost always ephemeral, and no recording of it survives afterwards. But that's fine, because the actual fun was in the creation.

That said, this is certainly not a requirement for being an artist: plenty of creators also find large parts of whole creative process tedious, and are focused on just the end product.