You have yourself at a logical fallacy here that needs to be adressed. People who are the crafters and such don't want difficult content... because they get tomes faster. That's not the fallacy, I just wanted to point that out.
The fallacy is that you are saying that these people want this content... but at the same time arguing against people that wanted this content to improve player skill and improve their overall experience. I'm not going to give you some attitude, but I'd like to point out that just because someone "wants" something doesn't mean they should get it. I'm not here to say your points don't have any merit, I do agree that the 2 second aoes can be unfair for more casual players because more casual players may not have as good internet connections because of monetary restrictions. But I'm not saying others have no merit either, giving more difficult content can in fact increase the skill of the playerbase since the game has basic expectations of its players instead of just giving 3 bosses that basically don't do anything in terms of damage and mechanics are as lacking of punishment that it's the teacher not laying down the law when their students aren't obeying the rules.
Want =/= need. Just because someone doesn't want something doesn't mean it's the content the entire community needs to make it bigger/more sustainable in the long run. This type of content is exactly how you do that.
