FormerlyHemlock
Hero
It also allows shenanigans like throwing your sword to kill a kobold at 60 feet (using it as an improvised thrown weapon: technically you'd kill it with a melee weapon so your bonus action attack would trigger), then dropping your shield, drawing your maul, and using the -5/+10 to splatter a kobold in front of you.
It takes an action to doff your shield, and you just used yours to throw a sword.