I understand your concerns, we had the same reactions from some of our friends, and I can assure you that the integration is planned, and any redundancy, duplication, or patches that we have right now for some tf code will be removed.

thank you for taking the time to have a look at the project, and I am very happy that we are receiving such a constructive criticism.

It was always possible to train Keras models in a distributed setting (I was doing it in late 2015). And there's built-in, one-line integration with the Estimator API coming in the next version of TensorFlow.