We can't compare Borderlands levels with Destin y levels. The scaling would be entirely different. The Vex have shown that they have portals all over multiple planets, ad we have no idea where their nexuses are. Gaige punching through concrete just means she hits as hard as a sledge hammer. The Guardian armor consists of laminated plasteel with strengths enhancing servos and inertial dampeners. A sledge hammer wouldn't do anything, really, and the fact that a Titan punch hurts a Titan by itself proves they lunch harder than Gauge can.