Subsystems should configure a dispatcher by default
Currently clustering, and after #3485 remoting exposes a configuration for separating their execution with a dedicated dispatcher. Since most of the users want this anyway (to avoid starvation of these subsystems), and there are only a few users that don't need it (low-thread count required), we should make the major case safe by default and the exceptional case manually configurable -- i.e. we should provide dispatchers by default.
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