If I said 'X is so easy I could ditch my mouse and keyboard and beat it with a rockband drum kit as a controller', you'd be forgiven if you thought I was talking about LFR. I'm actually talking about Dark Souls. Yes, the poster child for you can make a mainstream game difficult and people will love it is so easy - for elite players - that they have to do crazy stuff to be challenged by it.
I don't see Method breaking out the drum kits to try and wring a challenge out of WoW.
The elite difficulty of WoW is a serious contender for the most difficult content ever put in a mainstream game ever. The last armory sampling had 0.02% of the player base beating mythic blackhand. That shit is hard. If you say you want hard content, WoW has it.
Some food for thought:
Raid difficulty is inherently more punishing. If you have a 50% shot at not messing up the all mechanics of a Dark Souls boss so badly that you die before you get the kill, you'll breeze through Dark Souls. If you put together a raid 20 of people that have a 50% shot at not messing up so badly they die during the fight and you need 18 people to live through to the end of the fight to win, good luck progressing with your 0.02% change of having that happen. Hard mechanics and a requirement that the majority of people succeed at those mechanics is exponentially more demanding.
Raid difficulty is also more punishing because you can't make attempts easily, you need to assemble a large group to even practice. If you need more practice and are therefore messing up in front of that large group of people, it's embarrassing and stressful and you can get yelled at or flat out kicked out. That's way more punishing than Dark Souls.
What's hard for a below average player is trivial for an elite player - but 50% of the player base is naturally below average, 1% of the player base is truely elite.
Elite people in WoW have been elite for so long, they can easily forget that they weren't elite or that other people aren't elite.
Elite players in WoW tend to treat the game like serious fucking buisness. The average play treats it like a relaxing video game. Who has a more realistic view of what WoW actually is?
Elite people in WoW find things to be easier because they're good. But they also get exponentially better gear than the common man and tend to get it very quickly. That compounds how easy they find things, which tends to exaggerate how trivial they find things.
The average player doesn't want things to be trivial, they want it to be interesting but relaxing for themselves. Elite players can be so far away from the average player that they have a very warped view on what trivial actually is. Their feedback on difficulties that aren't intended for the elite is seriously warped.
If you think of yourself as an elite player and you're giving feedback on the easy difficulty, your feedback is worthless. Do you think a below average player will give valid feedback on the difficulty of mythic difficulty ('it's too hard')? No, they're way out of their league, it's pointless because it isn't for them.
If you say you want hard content, but also say 'after doing it on LFR I've seen it why would I want to do it again, I have no motivation?' that is prima faci evidence that you did not want hard content. Your desire for difficulty could not possibly have been satisfied by doing LFR, so you still should have that unsatisfied desire, right, how is that not motivation? Yet you deliberately waited for LFR to be released and deliberately chose it instead of going to a harder difficulty. If you deliberately went out of your way and waited to avoid difficulty, face it you never had an actual desire for difficulty.