The slow speed of using the wall interactable means they cant use it against your breath pressure, and by activating trait constantly you can punish them for trying to MB it, while they generally can't stop you from using it. To end a round you can use it after your combo for a lot of guaranteed damage, especially if your trait is up. At round start, the throwable interactable spaces perfectly with your F23 F23 F2scoop 3 punch, while being a short enough stage that they're already cornered after that.
Lots of reasons.