> What alleviates my worst fears is the knowledge that every technical user at Apple itself needs to use their Mac as the powerful Unix workstation OS that it is.

What Gruber didn't realize is that Apple gives its engineers special internal tools that can bypass the restrictions we on the outside have to suffer.

I'm sure it's also the case that internal development macOS builds are compiled differently than public release builds. They basically have to be for Apple engineers to modify them during development.