How would the microservers keep up to date with each other fast enough to be useful? "eventual consistency" doesn't work with real time strategy games.
How would they not? Latency between servers would be near zero, and if they all handled point to point transactions while broadcasting their state on each transaction, you're getting all the power you need. We're not talking about complex processing here. It's an RNG coupled with simple health and xyz.
Broadcasting their state to what? All the other nodes? So each "microserver" would still need to handle thousands of connections and data for every player?