Comment by dustbunny

> requires you to assign authorities to every entity and to send a remote procedure call when attempting to affect entities you do not control.

You can consider every object to be server authoritative and then only send inputs from the client to the server. Other clients don't need to know about other client inputs. They only need to see state changes from the server. Clients functionally only have authority over their own input. This is a simple model of state synchronization that doesn't have the extra complexity of having authority over random objects. In this model, you only do a rollback if the server state differs from your predicted representation of the state. Besides, your game tick should be fast enough that you can rollback and resimulate every frame multiple times anyways.