So what kinds of things would be nice to have excluded from us casual scum? Raiders already get better gear, unique titles, achievements, pets, mounts etc. What else? Your nametag glowing purple and a loud fricking emote that says "BOW TO MY MIGHT CASUALS, FOR I AM HARDCORE" when you don a full current tier heroic set?
You get plenty of exclusive stuff. What you seem to want is for less people to have it, that is, you want to be a ... nah, won't say it.
I was simply positively happy to get timeless gear, so I could more easily solo some old content and even some pandaria 5-mans. Obviously this was a terrible affront for all the hard working raid people, but I think you can get over it.