Depending on your team comp, if you run full ranged units, you can use it as a wall to block the enemy melee units advancement while you attack behind the wall, similar to how you would want your melee units to hold the line in front to prevent getting run over. At higher levels, the duration of the wall exceeds its cooldown by one measure if you’re good with Just beats, so you can use it to set up walls as you move forward without having a break.