I have seen the like of this for a couple of decades and it certainly needs a movement, for the want of a better word, to formalise best practices for who is responsible for what. The best places I have worked there is a discussion where this is negotiated on the basis of experience, knowledge and requirements for ongoing support. The worst places have made it a case of responsibility pingpong. Obviously the best places assisted each other or, in the terms of the editorial, leant on and learned from each other.