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That alternative IPC is called Varlink (https://varlink.org/). It has been around for a while, and initially we only adopted it where D-Bus was just too bad to use, and only internally. Over the last couple of releases that changed however: we started to make heavier use of it and provide public interfaces via Varlink in addition or instead of D-Bus.

In many ways Varlink is much nicer to work with than D-Bus: it's a lot simpler, it's brokerless design make it a ton faster, …