I got that from the Sprint tech officer (CTO or other, don't recall) who detailed in a financial publication interview that carriers can easily go to that level of spec detail, and the makers will go for it because they consider it front-line product feedback that will improve sales.
You work in mobile device manufacturing - tell me how Verizon manages one-off models from the rest of the world, complete with nightmare upgrade stories as a result, with increased memory but they can't specify that level of battery detail.
No intention of being confrontational in my choice of language, just saying, look at the forest instead of trees - how many changes go into layout, inventory, QA, acceptance, parts handling, supplier contracting and firmware just to put in a bigger MCP to satisfy the Verizon increased memory spec?
Makers respond to buyers, same as it ever was.