Essentially, the filesystem, pipes, sockets are pretty safe to assume to be always present, and you can develop against them without fear (though please handle the errors). With dbus, you have to handle a number of additional cases, and it seems more difficult than real programmers are going to do in reality.
For that problem alone, I question the value of having dbus at all.
Then there are the security concerns.. but that's the topic for another day.
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