Whether Blizzard intended it or not, to the vast majority of the playerbase, LFR has always been about being a big juicy loot piñata for them to whack at once a week. Proof of this statement you ask? Imagine if the gear it dropped was below Heroic dungeon level gear ilvl, or if it didn't drop loot at all? Who would be in there just to gear up for heroics or for the lore experience of seeing the end-boss go down? Most of the players that clamor for this type of crap saying couldn't care less about that.
Really, all this has been about, is just the new mentality of the playerbase finally feeling that Blizzard should be responsible for making sure those that put in the work, maximize their performance, and earn hard-to-complete feats in the game, never have anything that they can't have for practically free, with no effort whatsoever. Proof of that? Look how we now have gradual nerfs over normal and heroic modes, giving those same players access to not the content, but the GEAR that comes from clearing that content. They already got to kill all of the bosses, they have the aesthetic look of all of the weapons and tier that comes with LFR, why do they need to clear through harder content made easier, thus negating the point of 3 difficulty levels? It's no longer harder, so you mighta as well have just stuck to the freebie mode.
But why do they want to clear it so bad? It's not about the lore, and it's not about the progression. It's about the loot