Each raid had two difficulties that someone could engage them in: normal or hard. Both were challenging and would wipe unprepared parties. There was no lore or story difference between the two. They literally were just two different difficulties for the raid.
Hard modes would give items that were slightly more powerful and had different colored skins, but not so much more powerful that they become a requirement of progression. A person who completed the normal modes for their full normal mode set would be prepared to move onto the next content patch when it came out just the same as the players who did the hard mode.
Normal modes were nothing like Crystal Tower in terms of ease. They posed a significant challenge to players, but the way they were tuned required less time wasted wiping than what the current Coil difficulty is set at, which is more akin to hard mode. If we were to put the numbers of the gear acquired into perspective, it would be like ilvl 105 gear when Syrcus Tower and 2nd Binding Coil are the current raids.
Please also consider the fact that by the time Wrath of the Lich King had come around, addons providing clear indications of boss abilities being activated were mandatory in virtually all raid groups. I'm not exaggerating at all when I say that. Addons that gave notifications of boss mechanics were mandatory for raiding. That kind of says something about what the general audience feels about having to constantly look at the boss's health bar for a cast bar to appear. Individual players can say what they will, claiming that they like to watch for cast bars, but its pretty obvious from how prolific addons of that type are in the genre that most people find it incredibly unpleasant.
I am making this suggestion because the end game community during Wrath of the Lich King was far less volatile and more helpful than what I am experiencing here in your game. I would like the community to be able to enjoy the story as it happens, provided they are willing to give their all. Unfortunately, the current design means the peak effort of only a few players will lead to that result.
Edit: And for those of you endorsing paying gil for clears... No one pays for a game to be walked through it, thank you very much.