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The failure mode for a factory is usually “bob continues to assemble widgets” - they may miss out on an optimization because Alice has to half disassemble the widget later, but it all still works.

Programming can fail much harder.

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Really? If there are safety issues unresolved, the factory could burn down or people could die… programming rarely puts people in similar life or death situations

Every mode of transportation except for biking runs on software nowadays. Every bridge is designed with software. All of our lives are to some extent threatened by bad software.

"Safety-critical systems now usually rely on software" is a distinct and largely independent statement from "software is now usually safety-critical". The former is true, the latter is not. (This is actually a pretty clean example of the "Affirming the consequent" fallacy.)

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