Well, its going into the kernel as kdbus, which you could argue is bloated. Linux is much bigger than the BSDs, although it is modular and you can remove it, but the big distros use much of it so you can't if you use them...

A lot of things in linux are faster than in the various bsd kernels, some of this owing to having a few optional codepaths rather than just one.

Also, kdbus basically means there is in fact /less/ code made necessary by using the dbus protocol, since you don't need the daemon anymore, it also means lower latency.