Sorry holy paladins, Elemental shamans, etc. Good luck finding a 2 handed healing mace to transmog into the silver hand or a fist and shield for elemental. Artifact appearances are spec locked.
Edit: Abit of an overreaction, but i hope this changes. We have the power to change this. Let our voices be heard. Because weapon drops are a thing, there are certian combinations that are really rare. i know blizzard doesnt want people ignoring weapon upgrades because they cant be mogged to your artifact. Making them class wide, eases things up. I'm sure this'll also encourage them to make cooler weapons that arent artifacts. Tho the argus weapon mogs were nowhere near as cool as the artifacts, except one of the staves and 1-2 antorus raid drops.