TODO does not imply no plan or that we haven't thought deeply about the problem. Prioritization is imperative when you're building an MMORPG and a new database with a small team for both.
How can you think deeply and plan for something when you don't know what don't know. You can only really understand these things when you've taken a game using these latency hiding techniques into production, and then after this, you'll probably realize that some of your original ideas were wrong. Where does this leave SpacetimeDB then?
I mean, they are dogfooding their own database. If they’re making a MMO game with it presumably the game has latency masking netcode, even if it isn’t in part of the database.