which makes them even more like the nightborne, for the nightborne sinned as well, both as highborne then recently as nightborne, but the shen'dralar ones that come to the night elves show their willing ness to overcome, they share that in common, and share the same with the night elves, who were part of that empire too, and never stood against the queen or stopped it, enjoying all hte benefits of the crazy over use of magic, until it was all gone, and like the nightborne just did, rather than cling to the past, they let go and try to make amends, in so doing they have hope to forge a bright future, and one that includes the arcane for their willingness to surrender it is what makes them genuine masters of it not mastered by it. As such they qualify themselves by their resolve to be it's stewards and handle it - even though many chose the priesthood and druidsm, those that choose the arcane do so as true masters, not slaves of it.
This is they share because they have all gone through that process - [this is only with respect to that particular point - there is more ofc]