> Could you imagine a registered nurse being asked to expain why they have a blog about astronomy and not nursing?

That hits pretty close to home... I'm a doctor who has a small blog about the implementation details of the lisp I made.

> Managing Type 2 Diabetes isn't interesting enough for you to blog about?

If someone asked me this point blank I think I'd laugh out loud. It's interesting enough for me to keep up with the latest evidence, thanks.

> Whens the last time a nurse did a whiteboard interview?

To be fair, healthcare professionals have some pretty gruelling training and difficult licensing examinations. Some amount of preselection is taking place. Nobody needs a license to write software.