It breaks down as soon as you have an offline scenario. You can only assume the server is authorative if there will not be network partitions or if writes are n

It breaks down as soon as you have an offline scenario. You can only assume the server is authorative if there will not be network partitions or if writes are not accepted on the other side of the network partition (meaning on the client). As soon as the client accepts writes while offline those writes become authorative and will need to be merged with whatever changes the server saw.