Now that we have the full details on the cards, I don't see why there can't be some randomness in which dps card you get when you draw. or which curative/mitigative card you get. They really don't have to be separate decks.
But also, I don't really care. RNG for the sake of RNG isn't good class design
Astrologian is (and has always been) designed to be a "plethora of single target buffs/casts/skills" Seems like the changes make perfect sensse for how the job is designed, especially since we're losing dps buff cards.