This is a weird AA because it buff spells granted different AA, but the original spells also don't do much either for most of us.
The original AA was obviously set up with the intentions for specific classes to use a specific one of the 3 spells granted, which is clear as not all priests even have pets for sacred follower.
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(the 3 spells without the tiny boost litany of destruction provides, for anyone else looking to avoid respeccing to remind themselves of what these spells did)
I always thought the Litany of Destruction AA was odd because it left off a buff to Casting Expertise altogether.
I would love to see Litany of Destruction changed to provide a meaningful buff to all 3 of the Litany of Combat spells, bringing them inline with current stat values.