Except in Minecraft, the world is voxel so to sync destructible terrain I only need to send the x,y,z of the block removed.

Going by my logic, there are MOG’s and there are MMOs. Guild Wars 2, World of Warcraft, EverQuest 2, games where thousands of people can be on screen at once, where that server instance is synchronized with the rest of the cluster, for one seamless virtual experience. I’d say half of the self-proclaimed mmos ever really reach massively-multiplayer status. Games like Dota 2 and CS2 are played by millions but I wouldn’t say it’s an MMO because each match it’s 5v5.

Realm vs Realm or World vs World mechanics explain my perspective perfectly.