You forgot to address the random aspect of the failure cases.

Real world is chaotic, technology was always first about controlling, then improving said control. A lot of the risks in the situations you described have been brought down that the savings (time, money,…) are magnitude more than the cost of the failure.

I’m not asking for perfection, but something good enough that we can demonstrate the savings outweigh the costs. So far there’s none. In fact, we are increasing it. And fast.