Eliksni have wallowed for centuries in the fallout of the travelers cowardice.
The traveler has done nothing but run from the darkness until it physically couldn't run away anymore, and it's done that regardless of the good people it has hurt.
The Traveler made the eliksni a target by being near them and lifting their civilization, and then rug-pulled them like the most ruthless evil.
Due to this, the Traveler should send ghosts to turn dead eliksni into lightbearers, and they should become a playable race.
They've suffered for too long, and I want to play an eliksni. So bungie should make them a playable race, too. It's a win-win!
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We dont' really (fully) know what The Traveler's history is.....or what her agenda is. We have hints....but not much more than that. But I think the better question isn't so much "Why did she abandon the Eliksni".....but rather "Why does she stay and fight for Humanity, when she didn't before?" I think the answer that that question is that humans----for our other shortcomings and flaws---have the ability and desire to create diverse communities (however imperfectly) and the wish to build bonds across species lines. In the Lore of Halo the Forerunners (the ancient beings that create much of the advanced technology in the Halo Universe) had a society built around what is called "The Mantle". Short for the "Mantle of Responsibility". A philosophical belief that advanced senient beings had a responsibility to protect and nurture the diversity of Life. In many Ways that is what The Traveler seems to represent...and what She seeks to defend. While that is CLOSE to what Humans tend to consider Absolute Goodness....it isn't QUITE that. But It is consistent with her actions. IMO, I think she kept leaving until she found a species to invest in who would SHARE the Mantle with her....instead of selfishly gaurd her gifts for themselves and those like themselves. ...and you see that in the Vanguard seeking to build a coalition of the Like-minded across species lines to fight the Darkness. ...and the fact that it was only when we stepped up to defend all life in the system (by destroying Ghaul and his plans to destroy the Sun) that She was willing to step up and directly intervene.