I think you're stretching the meaning of "CRUD" far beyond its useful range. CRUD is a fairly specific term that refers to a database with a user interface. There are a great many applications that are built around this basic idea. Software like the linux kernel superficially resembles a CRUD application, at a high level, and you could identify elements that are like a CRUD application, but most of the hard problems solved by the linux kernel bear little resemblance to the class of web applications called to mind by the term "CRUD."
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I think you're stretching the meaning of "CRUD" far beyond its useful range. CRUD is a fairly specific term that refers to a database with a user interface. There are a great many applications that are built around this basic idea. Software like the linux kernel superficially resembles a CRUD application, at a high level, and you could identify elements that are like a CRUD application, but most of the hard problems solved by the linux kernel bear little resemblance to the class of web applications called to mind by the term "CRUD."