I was not aware of this issue, but I agree-- it is good to see that older content does not get ignored :)

It made Orange especially frustrating, because you'd be in a party where the average level was around 42, and the bosses are all red to you. And there's a larva that just KEEPS SPAWNING constantly, aggroing on your party from behind as you're trying to progress down the tunnel. And then at the end, because it considers the dungeon a lower level than it is, you get rewarded with the same level blues from the random bag that you've been getting for the past 10 levels, that you probably don't need any more.

And it made Purple a joke, because it only has one boss, that's the same level or lower than the average group, and the rewards for it were the higher level blues. Why couldn't they have added Celebras onto purple? Now the only way anyone kills him is if people actually stay together after killing Vyletongue or Razorlash.