The problem with this topic is that once they do that, the next threads will be people complaining they cannot do the current content with a random pug.
The next step will then be either nerfed content within weeks cause of the non stop whine or an LFR esque system which is another can of worms.
The way it is done now that statics/FC's clear the content and when it comes to duty finder they can add stuff like echo or straight up nerf so the rest can kill it.