Dessert Nomad
Adventurer
Further, dex was important to to wizards to help them stay alive, so it wasn't unusual to have an attack adjustment with missile weapons as a wizard.
You're assuming that you got to place your stats.
You're implying that magic user players typically made a decision of some sort to get a higher dex on their character. While it wouldn't have to be placement, the game where you imply something but don't specify, then play 'gotcha' if someone doesn't correctly read your mind when they reply doesn't really work well when someone calls you out on it.