The likelihood that you will see a blog post about the
  "benefits of being a male software engineer" is exactly the
  same as the likelihood to see a blog post about the
  "benefits of being a male social worker".

You draw the wrong conclusion from this observation. You are not taking into account that male social workers are nowhere near as inclined to keep a blog as software engineers are. In fact, in more traditional media, regular stories about the working experiences of, for instance, male nurses have been quite common for decades.