Giving a XP boost to DPS instead of tank.

[Miles_Maelstrom]

They could also: not ruin tank stat scaling, breaking it in 4.0 after fixing it back in 3.2; not release two interesting damage jobs at once, without anything else; and not show such favoritism toward one of the healers while stepping on the others.

SE fostered this environment.

I mean this is normal for expansions, you get a big influx of those players who only play for a short time right after an expansion, and those fairweather gamers tend to play damage jobs. SE didn't help matter with the above issues.