This is why it won't be used by humans a lot I think.
Originally Posted by Ant P.
In fact, next release should also include xorg.conf.d and a lot of functionality Xorg configuration was missing. So it will for example be possible to use a file for each input, video device or monitor and assign them to one or all layout configurations.
I don't know where udev-fdis fit here (they won't be needed then), but as far as I understood, the X-server has to be able to directly communicate with udev for that, therefore it's support.