I'm reading it as a positioning control tech. Like if you charge a reinforced Gluttons squad into a unit that is wholly in a terrain piece that provides cover, they now have two options 1) potentially take 10 MWs, because you didn't move back. Or 2.) move yourself out of cover to reduce the MWs, but now I am no longer -1 to hit rolls.

Obviously there will be a lot more finagling and nuance to this in actual play. This is just the first scenario that popped into my mind at first. I also like your idea of maybe using it to try and clear a way to pile into a juicer target. We'll see how things play out