How do you envision this architecture?
We are also limited by what the client wants. That mainly means we need a single world server, can't really do anything about that.
Zones can already be split up already (hell, you could limit the DB too, at least for zone specific data, but that might be a pain to maintain global NPCs [pets etc])
I guess the main thing is how would you want to handle the DB. We need at least a single authoritative source for player data.
Most people don't really see a benefit since they can generally fire up hundreds of zones and server hundreds of players on a single beefy enough machine. And if it's not beefy enough they can just run less zones.
P99 last I knew had at least 2 servers to spread the zone load across.
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