Headcanons on why mages don’t wear armor:

• magic and mana corrodes metal (that’s why so many rpgs have heavy plated characters weak to spells)
• armor has no pockets for potions or books or herbs or snacks
• mages read and do alchemy in tiny spaces so armor gets in the way a lot and libraries hate clanking noises
• most mages are skinny weak ass nerds do u think they can wear armor