Missing the AF_BUS

the tradeoffs in the first issue can be configured in the config
file, it can throw errors when the buffer size is whatever you like. there are also some list/bug discussions of other behaviors that could be useful to support.

the second issue is not dbus's fault. that kind of thing is often from making a daemon when a library would be better. it's a bug in the app design.

the third issue I've mentioned repeatedly myself including in the threads I linked before.

but none of these three thing are concrete examples of user visible operations. in most real world cases all three of these problems are gotten away with and it isn't perceptible. n900 is the most often mentioned case where they aren't and if you're correct here, N900 has at least one really bad setup with half a dozen daemons.