This is great! The main questions I’m anticipating are “why cant we just improve the backend apis” and “why do we want the frontend team to own an Service?” I

This is great! The main questions I’m anticipating are “why cant we just improve the backend apis” and “why do we want the frontend team to own an Service?” I think your point of focusing on how the requirements of the BFF team differ from the backend team could be a strong argument. Like the backend apis have to be low latency and consistent whereas the frontend apis can accept some higher api latency in exchange for lower page load speeds and eventual consistency via caching.