I can't really speak to this point, but I am curious, when did computer science and software engineering get rolled into IT?
15 years ago, I would not have said software developers, software engineers, or test engineers were part of IT. IT was that department that kept the corporate computers working and worked for the CFO, not part of the department that shipped products and worked for the VP Engineering.
In the past 5 years, it's become much more inclusive (or so it seems to me.)