The data is replicated across the Alpha replicas.
Not exactly. The zero has just a few jobs. Like timestamps, UID leasing, data balancing and so on. So it won’t be in pressure.
Not that I remember. But this is just an optimization. In general queries are distributed by nature. But the deserialization happens on a single node. And if you have an app with many clients, many requests. This could be a temperature point. So it’s better to distribute. To lessen the burden on the deserialization.