Lancer not able to roll "need" on lancer gear.

[Polantaris]

Currently items that are equippable by various classes but are more specifically tied to certain roles (such as +INT rings/necklaces, certain high-armor body pieces) can only be needed by the roles they are designed for. Sure they can be an upgrade for a different role, but are vital for that role in particular, hence the difference

In beta phase P1-P3 you could Need roll on any item that matched your class/job. This resulted in people Need-lotting things that were not intended for the class/job they were playing even if they are able to equip them.
They changed it to what's there now because of that.

Yes, some pieces can list only GLA/PLD/LNC/DRG, because those are the classes/jobs that can wear the item, but if it's intended mainly for tanks, only GLA/PLD can Need roll on it. If it's intended mainly for DPS, only LNC/DRG would be able to need lot on it instead.

There's a lot of context you don't seem to understand. Just because it says disciple of war does not mean it was tank gear. Greed kills folks.

The problem with this line of thinking is that there is far more often the likelyhood that people will roll Need on things they don't actually Need, nor do they ever intend to actually use. It looks nice, so they decide they'll sell it, and roll Need. Now, because being able to choose "Need" based purely on what class the item was designed for, not what classes can equip it, gives people more reason to just mash Need on everything, and if they're the only DPS, or Tank, or whatever, they'll ALWAYS win.

Also, how about the fact that we can change classes at will? What if I have Lv.50 for every class, and some item drops that a class I'm not currently could use? With an active class changing system in place, where you can change class nearly whenever you want, restricting gear distribution to this extent is ridiculous and bound to cause frustration.