But we only know it does because of physics, and without knowing there isn't a risk of banks floating away, people would be afraid of building banks. And, of course, mechanics generally are what enable the analysis of large static loads.

Same issue with how studying life expectancy and mortality allows you to quantify the risk of death, injury and disease, thus enabling life insurance and health insurance.

The problem with the claim "this is all physics" is that, yes, Newton wrote down the original formulas for mechanics, but those had to be translated into all the engineering practices to be useful. Most of the economic value comes from engingeers who have mastered nth-order derivations of the original equations.