Uselessd

Uselessd

Its a threat by the person currently doing all the work, effectively saying "it's my way or the highway".

Not really. You can use libsystemd (which contains the userspace part of kdbus) without using the rest of systemd, and if you don't want to do even that then writing your own userspace kdbus binding isn't exactly rocket science.

In effect the “threat” is that Lennart and his colleagues will eventually change one of udev's internal implementation details. The kernel developers do this all the time – with much less warning ahead of time – and nobody considers that a “threat”.