So there's two types of people I think when it comes to casuals in this game:

1.- Is the group that takes their time, have a busy life, or would rather play other games so they slowly get through the content of the game.

2.- There's this other person, who has exhausted every single corner of the game, and has finished or is uninterested in: All the Golden Saucer minigames, collecting Triple Triad cards, doing all 3 100 floors of Deep Dungeons, getting all the rewards in Eureka and Bozja, doing all PvP content, getting all the combat, crafting and gathering jobs to level 100, doing all side quests, all role quests of the last 3 expansions, customizing their FC or personal house, know every dungeon, trial, raid and 24 man raid that's not current by the back of their hand, have finished Island Sanctuary and then go claim they are playing the game casually.

If you are the 2nd type of person, you're NOT playing the game casually, you've invested hundreds of hours into this game and are bored out of your mind. The next step of things to do would be to do the more challenging content (extremes, savages and ultimate) of the game but a lot of people are anxious, uninterested and just get really angry the players who enjoy anything challenging get rewards, even when the new chaotic raid doesn't make it exclusive at all.

Think about how 90% of the game is casual and dominates any challenging part of the game, where as the challenge of an extreme and savage are time dependent. Once 7.2 hits, you won't be able to experience what it was like to do M1S-M4S due to power creep, you'll be able to tank through most damage and skip mechs like crazy.