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.

Aug
poe4orbs:[Lake Of Kalandra] PoE 3.19 Mauarder Starter Builds
Here is the latest PoE 3.19 Mauarder League Starter | Endgame | Fast | Cheap Builds brought to you by PoECurrencyBuy.

Jan
poe4orbs:PoE 3.9 Shadow CoC Assassin Endgame Build
Let's see how this PoE 3.9 Assassin CoC build works. Ice Nova synergises with Frostbolt, being able to expand from up to 2 Frostbolts, basically dealing twice the damage per cast.

Feb
PoE 3.13.1e Patch Preview
This is a preview of 3.13.1e patch notes to give you an idea of what to expect. Check them out below!

Jan
Best PoE 3.13 Ritual Templar Starter Builds
Many of the builds in this PoE 3.13 Ritual Templar Builds guide are good for starter that are popular with many players. For the three ascendancy classes of Guardian, Hierophant and Inquisitor, the focus of each build is also different. Hope it helps you.

Dec
On the topic of sin's Rebirth Path of Exile
There's a point to be made about having 55%(or more based on flask effectiveness) phys as extra chaos at the press of two buttons.

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.