This could work in very small projects. Still very risky. Say you flag a write as "local". Later, some other place in your app starts relying on this write in

This could work in very small projects. Still very risky. Say you flag a write as "local". Later, some other place in your app starts relying on this write in another locality. If you don't update your write spec from "local" to "primary", you don't have a consistent database anymore, but you will make decisions thinking that you do. Now consider a team of 10. Or 20... Mayhem can spiral very quickly from there.