They became easier to obtain and were added to all three classes which is why. Maybe they could have made this apart of the Warlock aspect as Bore said would help Warlock arc a lot.
[quote]I don't get it while we are at it. you guys have turned traces into worse elemental wells that teammates can't even pick up[/quote] A side effect of it being made accessible at the same time as other potent abilities. Honestly should just be baked into one of the warlock aspects.