I have unpleasant experience with D-bus failing and I'd rather keep it away from the filesystems I use, because it was impossible to troubleshoot properly and even clean system shutdown was difficult (I have enabled SysRq on my system since then). Also, D-bus is a higher abstraction than a filesystem is, so making it a critical dependency in the management of a filesystem turns the dependencies in the system upside down, making it more difficult to recover when things go wrong. I think this is very rational evaluation.
Biting the hand that feeds IT
