This means you now have legacy items
Uniques in POE are supposed to be UNIQUE, not better, fluffed up and fancy rares. Some are just fluffed up rares, yes, and others are simply leveling items, but the majority have UNIQUE modifiers on them that cannot be gained anywhere else in the game, and as such can be build enabling. What you're thinking of is something along the lines of Legendaries from other games, which are the super GG items that have no better equivalent and are very rare.
For future reference, any characters in temporary leagues will be returned to their parent leagues, regardless of whether or not the game-play mechanics are being transferred to the core game. However, any League Specific items that you have in your stash/characters will also be transferred to standard, once again regardless of if the mechanics are going to the core game. This means you now have LEGACY items.
May
Path of Exile Skill Revamps - Part 6
It's only 3 days to the releasing of POE Incursion League, which is the core content of 3.3.0 updates. And GGG's Skill Revamps has proceeded to part 6, so I'd like to show you more details about Skill Revamps - Part 6
Jul
New Player Should Never Play HC
I have performed mostly HC in each and every game which has it, I began PoE HC also it was great when Used to do. Hell, I even find Invasion is the most enjoyable time I have ever endured within this game
Dec
I think anything that cancels out a build is pointless in Path of Exile
Using Marauder/Duelist with The Perfect Form + Arctic Armor, Essence Worm + Hatred/Grace/Haste/Determination/Vitality with Blood Magic might be quite nice.
Oct
Best 5 very best Path of exile Builds for Duelist Gladiator
The Gladiator performs effectively with dual wielding or one-handed weapon (which includes wands) and shield combinations. The tree gives possibilities to build about applying bleed and enhancing the player's blocking.
Dec
PoE 3.12 Flashback Starter Builds | Fast, Cheap, Endgame
In the Flashbach event, the higher the level, the better the chance of getting official prizes. Poe4orbs recommends some popular starter builds to you, if you haven't joined flashback, you might as well take a look