Can be used to attack over strong defense monsters.
Most monsters have better attack than defense and would always be put in attack position.
Flipping a monster could trigger their effect.
Can be used to check your opponent's face-down monsters.
Some monsters like Wiz, Sage Fur Hire have high defense and annoying negation effects. This prevents you from changing it to attack position with your spell/trap effects. You can use Samurai Sword Baron's monster effect instead to expose it's weak attack stat.