I've thought of an idea of how to fix resup binds being op, and I think the best way to do it would be to have the area that makes the shutter open be unable to resup. That way leagues don't have to outright ban the bind because you can sorta circumvent it by just changing classes. This way it would be way more consistent and prevent people living by the skin of their teeth or times where people resup when they're outside the shutter (lol).
Example pic of how I'd imagine it look like. The area has to be a little wider than the shutter cuz you can open shutters from the corner