I'd say we just lack representatives in general for the Void Elves, aside from Umbric and Alleria the Riftrunners are about the closest Void Elves have to having characters that aren't faction leaders
So we have Alleria and Umbric who talk about not listening to the whispers, discipline, ect, then we get the Riftrunners where 2/3rds of them are some variety of unhinged void cultists (and then theres the other unnamed void elves who also come across as suspect talking about the wonders of the void and such).
Compare Umbrics
"The shadows serve us."
"Maintain focus and control."
"Do not bend to the whispers."
To Shadeweaver Zarra and Duskrunner Lorinas
"Here! We land here, just like the whispers say! Yes! Hahaha. Yes yes yes."
"Exquisite souls for the Void!"
"What a pitiful group. Prepare to be consumed."
"Ah... the darkness... embraces me..."
"Embrace the Void!"