May I ask you a personal question? What is the hardest part about Windows 10 Servicing for you?
Based on talking to many of our clients and partners, I would venture to say your answer would focus on the scary "Unknown". It isn't the actual process of rolling each update out, because once you have an efficient, repeatable, and industrialized process, it will almost run itself. It also isn't the initial testing and evaluating as each new version becomes available in the Insider Preview.
Instead, for most IT managers and executives that I have talked to, the hardest part is the massive shift away from those massive one-off big-bang migration projects every two to three years and entrusting your entire IT estate to a still to-be defined Business-as-Usual (BAU) workflow using sophisticated automation and management tooling when you might not know what it looks like yet.