Buried in the thread, about sixty comments down, is a response from someone who describes themselves as a sports biomechanist.
The post is long. You read it three times.
Here is what it says, stripped of the jargon:
Your foot is a biological shock absorber. It was designed to spread, flex, and distribute impact across its full surface when it contacts the ground. A healthy footstrike involves the foot widening at the ball, the arch dynamically lowering and rebounding, and the toes splaying slightly to stabilise the landing.
Every rigid shoe prevents some or all of this from happening. But for someone carrying more weight, the suppression of this natural mechanism has consequences that scale with load. The forces your foot needs to manage on each step — and the spread and flex it needs to perform to manage them — are significantly higher than the forces a lighter foot faces.
When you put that foot into a rigid structure that prevents it from spreading and flexing, you concentrate force at fixed pressure points instead of distributing it across the whole foot. The heel. The ball. The arch. Each one bearing more than its share, because the foot can’t do what it’s designed to do.