Supposedly after we killed the black heart , that prevented the dark future, and the shipstealer may not factor into this the way you think , Eido was her Luke Skywalker and her pure innocence changed something in Eramis, she was not the unhinged power hungry maniac we got in Beyond Light, now she just wants her people to prosper, and not under the witness subjection And Eris has learned to smile again, and possibly found true companionship in the drifter(we are not anyone's freind, we just chase loot) , so she is no longer in a desperate obsessed spiral torward darkness has she used to be. But all of this is subject to be torn up and ripped apart , Like all stories in Destiny