This is on topic of "we don't need 4 raid difficulties to cater to every playstyle". Why do people feel like exclusivity is bad? Raiding used to be THE level of awesomeness you wanted to achieve. Raiding used to be nearly exclusive to guilds only, thus forcing people to find a guild if they wanted to raid. You also needed to be somewhat "good" at the game and your class if you wanted to raid. There was no hand-holding, babysitting mode. There was one mode: raid mode. You were either a raider or you weren't. It gave (some/most) non-raiders something to work towards. When I first started playing and saw everyone in their awesome raid gear, it made me want to get better. That desire pushed me into theorycrafting and made me a better player. Having that proverbial carrot-on-a-stick is healthy for the game because it breeds better players in the end, and I think we can all agree (maybe?) that the skill level of the average player has dropped considerably over the years. Why? Because there isn't just one "raid mode" anymore, you have a figurative slider bar that lets you see raid content at your skill level. For some/most, they're content doing LFR or pugging through the LFG system, even despite the better gear in heroic and mythic. They're seeing the content, getting SOME sort of character advancement, and the game ends there. Waving Mythic gear in front of people's faces isn't enough to make them want to go out and "get good" anymore like it used to.
I know common rebuttals to this usually go something like, "Well, Blizzard doesn't want to spend dev money on something that only a fraction of the players will ever see" blah blah blah. I get this point, but its very easy to justify exclusive content when the game's better days had exclusive content. When every player gets to see the Super Bowl (albeit a watered-down one), there's no drive to see a "slightly-harder mode" of the same Super Bowl.