Vaulting is actually very important for game movement in the early game. Since weapon teams cannot vault it gives infantry vastly more approaches. If you look at COH1 if an mg had a fence next to it there was no way to get to it with a flanked squad. He just packed it up and moved it back. Now it gives a chance to push from multiple angles. Whether it happens or not in the game is irrelevant because it changes the way players go to set up before any engagement happens.
Vaulting makes the unit movement feel more fluid, and can be removed easily in worldbuilder. There are no downsides to this ability.
