But that's not true. I work as a developer or an admin depending on my mood and the money, I would not consider one able to do the job of the other even though I have done each with the same degree in hand.
The discipline of designing stable, maintainable systems & networks or writing code to requirements precisely and accessibly are distinct and often wildly different. Little of it comes with your degree.
That said, my current gig is quite good in that regard: "We support A, B and C. If you want to use X and Z you're on your own. Here are the guidelines on security and patching."