Working with a team on industrial projects is another thing than quoting from a book that - albeit somewhat naively - even talks about configuration management in one section.
Why should I answer your questions when you only question everything I say anyway and do not answer my questions?
If you understood why the absence of dead code cannot be detected by testing, and that there is no algorithm that can identify all dead code reliably and in finite time in a dynamic language like Smalltalk, your questions and implications would become pointless, since you then would understand why you never can be completely sure indeed; and that's all there is to it.
