It's weird that people still don't understand why Diadem 2.0 went the way it did. One of the complaints of 1.0 was that it was just standing in one area and zerging the same few mobs over and over until the time limit. There was no structure, so everyone went to the easiest and faster method and got bored of it. So to add structure to it, the devs gave a reason to actually move around to different islands and locations and fight different mobs. They did this by marking them with big blue glowing circles called fates. It's the same respawning mob spam as before, but with structure added to it. It was "just fates," but it was still the same thing as before. 1.0 just didn't have the fate marker over the mobs like 2.0 did.

What happened that made 2.0 fail? A certain niche of people got exactly what they asked for. They hyped it up as something and people that didn't want that thought they did. Once they got that content, they realized the didn't and never wanted it, so they stopped doing it.