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The latter sucks in major ways, since we basically had to reimplement a subset of the broker ourselves, with message multiplexing, subscription, signal matching and a lot of other stuff. Because this was so messy we never did the same for journald, userdbd or homed.

These two are just the biggest issues with D-Bus, but there are a lot more, in my eyes. Hence, quite some time ago we started to use a different type of IPC for these cases, initially just internally.