The reason that many people (not all) benefit from having an element of control (balance) added to their excessive rolling motion, is because their own soft tissue, posture and etc is not strong enough to cope with the excessive forces placed upon the body in a running strike.
Think of a door hanging on two side fixed hinges. If those two hinges are not fixed correctly, with equal weight on both, set in a straight line then over time and use of the door being swung, one of the hinges could well be taking too much weight/effort. This could lead in time to the hinge buckling/twisting and breaking early. Or could lead to the door frame splitting and becoming weak.
So the idea is that if the runner doesn't have either the 'hinges' set correctly or the ability to be 'soft tissue' strong in the 'incorrect' position (door frame being strengthened). Then having something else to help guide the correct pattern of the lower limb (smooth door swing) may prevent overuse issues.
There is an ongoing debate with 'phyiso/podiatry/biomech coaching as to what is the correct solution. That debate will rumble on and on !!!
I understand the analogy, but successfully preventing injuries by correcting these flaws with structured shoes is an assumption - there is no evidence at all to support this -none!
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