I don't really understand how you would write a game server using this tech. Lets say you need to simulate physics, pathfinding, animation etc on server. How one would integrate all of this? In regular world you just use unreal/unity headless mode that includes all of this but using spacetimedb requires ditching the game engine and reimplementing everything from scratch?
Forgive my ignorance, but why would you implement physics and animations on the server? I feel like you can get away with basic positional data and do the rest of that on the clients.
You need physics in order to make movement server authoritative. Otherwise player will be able to fly around and ignore collusions. You might need animation state in server if you are making a fps shooter and want to calculate raycasts properly.