There are many items that are MRD/LNC/GLA (WAR/DRG/PLD).

Some of these items, I can NEED as Marauder/Warrior or Gladiator/Paladin.
Some of these items, i CANNOT NEED as Marauder/Warrior or Gladiator/Paladin.

Don't ask me why, it's really strange.

All of these items are clearly designer for LNC/DRG, because they always have MUCH LOWER defense stats than proper tank gear, even if item level or Vit/Acc/Str bonus are the same.
Any tank using these items is gonna be very squishy.