the normal content is too easy

[Ronduwil]

And this right here is the logical failure point of everyone arguing against making the game challenging. They tend to take it to extremes and radicalize and distort the intentions of the OP every time this gets brought up. Noone is arguing this should be the case. In fact, I think you enjoy making up imaginary people making this argument so you can make it sound valid. No one is asking this, so you are answering to people who don't exist.

But it's the logical conclusion to what they're asking for. We've seen it in WoW. The high end community's chants of "make it harder make it harder" have made the game unrecognizable. The contrast was pronounced when I played Classic a couple of years ago and saw how the original raid mechanics weren't even as hard as the original LFR mechanics. If you run LFR now in WoW, its mechanics are on par with heroic raid mechanics from Cataclysm, with the difference being that it's a little more tolerant of deaths before the DPS checks wipe the raid. Please understand that difficulty is relative. Players who have been at this game for years will have naturally mastered mechanics that new players are still struggling with. They're barely even aware that these mechanics are a challenge anymore. So naturally, if SE perpetually scrambles to keep these players challenged at lower levels and in Normal content, they will eventually ratchet up the difficulty to a point where the learning curve becomes so steep that average players won't even want to bother with it. That's why it's not a productive goal for them. There's a time and place for everything, and the time and place for difficulty in raids is in Extreme and Savage content.

Plus, contrary to your claim, the OP explicitly suggested that SE should bring some of the difficulty from Extreme and Savage into Normal. In their own words, the rest of the game has absolutely zero difficulty:

Why is the game so easy a person who is half asleep could play it with no problem? You wonder why no one knows how to play well, yet make all of the content ridiculously easy. I'm no pro, but its kinda silly how all of the content save extremes and savage is so easy to learn and play with no difficulty whatsoever. People play games to enjoy mental stimulation, and when every single mechanic is telegraphed, repetitive, and predictable, the content becomes very linear and boring.

And here you are accusing me of going to extremes...