It is well established that we are happiest and most productive when we are working in a state of flow. Accordingly, any interruption of the state of flow can have disastrous results for productivity. The interesting question to me is, what constitutes a interruption, and what is part of the flow.
Is fixing a bad page break an interruption of the writer’s flow, or part of it? What about looking something up in the style guide? What about searching the CMS for a topic to create a link to? If, like me, you answer that these things are all interruptions to flow, not part of the flow, perhaps you will agree with me also that by and large tech writing groups are not set up to make writers as productive as possible.