Leveling an alt I ran a dungeon and had a 101 Priest healer who had the Shadow artifact equipped. Things went poorly as expected, but it made me wonder: with the wrong artifact equipped, do you get the stats from the weapon or do you basically not have a weapon equipped at all?
EDIT: The Priest was level 101, 2nd artifact doesnt unlock until level 102. If you switch specs without a 2nd artifact unlocked, you keep your current artifact equipped.