My understanding is that kdbus was mostly a new transport mechanism, so that the dbus daemon didn't have to implement all of dbus's features on top of unix sock

My understanding is that kdbus was mostly a new transport mechanism, so that the dbus daemon didn't have to implement all of dbus's features on top of unix sockets? I don't think there was an attempt to put the whole daemon in kernel space, and there certainly wasn't talk of exposing DBus as a VFS AFAIK Though I haven't read about kdbus in a long time, so I might be misremembering or have misunderstood something back when I read about it. Regardless, I was asking what bheadmaster would've preferred, and if the answer is "the dbus daemon should have been implemented in kernel space and that's what kdbus was trying to do" then that's fine.