The quicker Blizz phases out LFR the better.
They're also phasing out heroic dungeons, since regular mythics are heroics this xpac, and mythic+s are mythic.
They're just slyly doing it to not anger the casual crowd, and I for one welcome it.
Raiding without it being memorable is not raiding, they realized that. None of the casuals that only did LFR can explain any of the fights of previous expacs because they weren't memorable, just loot pinatas.
They gave casuals world quests as replacement loot pinatas.