I agree with this, but I wonder if its because people right now are just still trying to figure out the tech. We're in the beginning of the adoption curve, so to speak and specialties will come eventually.
As an additional point, I see DevOps expanding to DevSecOps, DevTestOps, and when the marketing folks catch up I'm sure we'll soon see DevSecTestOps. These are all just fancy words for being a more complete Developer - and enabling Developers to deliver faster.
Anecdotally... From where I'm sitting right now (devops IT, huge non-tech company), it hasn't actually solved the problem of dumping crap over the wall, because ultimately people balk when going to prod with changes. (Compliance/SOX, fear of change, gui based existing deployments, bad APIs, etc....)