The current end game reward structure ensures that end game players stay roughly together in terms of gearing, just as story and normal mode content at level cap ensures that more casual players can keep up, relatively speaking and will be geared for the next batch of content. The system of raid drops seems to have been tweaked sufficiently that players raiding will get gear they need, instead of having to resist rolling on something and seeing it hit the floor because they were waiting for something specific to their job. The system is fine as is.