It would be nice if everybody would publish code for their papers. But in a field where most people don't do it, releasing your code will probably not be beneficial for you due to the loss of the competitive advantage. I know for people with cs background this sounds weird but it is reality n academia.
In your position, I would only release code which is not too hard to reproduce anyway or which only provides negligible competitive advantage for you.
I mainly have "normal" paper in mind (experiments or data analysis) - if the main contribution is, for example, an algorithm which you want people to use, the you should publish an implementation obviously.
Tell you friend to watch What the Health [1]. Sure, it provides a somewhat biased view on the topic of eating too much meat, but it is thought provoking anyway.