Of course the counter example of this is Google, which, as I understand it, runs everything on containers. It seems like if its good enough for Google, then its good enough for the rest of us.
Google runs NOTHING on Docker. They have their internal secret proprietary container technology.
The concept of containers is fine. The troubles lies in the implementation that is available.
Google does publish https://github.com/google/lmctfy at least, though.
Edit: did publish