We have discussed it often in the past years in different channels. The old powerful items should be reintroduced. In my opinion it's a great disadvantage for players that aren't stuck here since beta and had no chance of gaining those items. They had been taken out of game, in other mmo's if a item is too powerful it would be nerved or deleted out of the database. Not for Istaria, those items and forms are still around.
We all pay for the game and either delete those things out of the database or give all a chance to gain the old legendary things. If they are too powerful they should be rebalanced. I don't see a reason why newer players have that great disadvantages.
My idea is to reintroduce these neat things, with a new questline, some kind of "legendary questline", it should be difficult and a pain and lot of work and time to spent to aquire these things.
For example:
Dim Crystal of Might
Misty Crystals
Veteran Dark Garnet Weapon Crystal
Boar Hide Mask
Thunder Cloud Forms
Kicker Techs
Dragon Event Techs
... and sure there is a lot more I don't think of ...