Why Supply Chain Security Fails in the Real World

People like to discuss software supply chain security as if it were a clean engineering problem with a clean engineering answer. It is not. In real companies, releases are pushed under deadline pressure, credentials are shared more often than anyone admits, legacy tooling survives far longer than planned, and third-party dependencies quietly pile up until nobody can explain what is truly trusted anymore. That is why a discussion like Supply Chain Security That Survives Reality matters so much: the real issue is not how security looks in policy decks, but whether it still holds when teams are tired, shipping fast, and operating inside imperfect systems. The phrase “software supply chain” sounds abstract until you break it apart. It includes source repositories, open-source packages, internal libraries, build scripts, CI/CD runners, artifact registries, cloud infrastructure, release approvals, signing systems, and update channels. In other words, it is not only about what developers writ