The game is not a gearmill. You play the content purely for the sake of enjoying the content, not for the purpose of endlessly growing your character power. This notion has been restated countless times. Playing for fun. My question is, are DE really that fun?
They are one of the biggest aspect of PvE, something the game is largely built around. They are used as one of the main selling points of the game in differentiating it from other MMO's, similar to what SWTOR did with their voice-acting marketing.
But at their root, when it comes to actual gameplay are DE really much more than standard MMO questing? As far as I can tell, they are not. Yes there are triggers and chains and whatnot, but none of that really changes how you actually play, you simply follow the chain, play your toon, kill some mobs, get some loot - just like standard questing.
If DE were just for leveling purposes I think they would do fine, but to build a large part of the entire PvE game on them? I'm not sure how long they will remain compelling and fun.