As someone who mostly plays draenei I really don't care about either faction. Draenei aren't included in alliance lore. Draenei don't have any current reason for fighting the horde. I'm not sure where I'm supposed to get faction pride from. Is it from seeing draenei be used as quest fodder as part of a human army under human command in a human base with human themes doing human things?
Beyond that the only time draenei really do things they're neutral. The bulk of their involvement in BC was neutral. In Wrath they joined the Argent Crusade because the alliance refused them. In Cata they were part of the Earthen Ring. And of course Velen's orders the last time we saw him was, "Go heal the Cataclysm and be examples that the mortal races of Azeroth should stand together against the darkness," or something similar. Next time draenei will get lore will be neutral for the Army of the Light. Why am I supposed to care about factions when draenei are essentially neutral? Why can't I go neutral and group with everyone like the NPC draenei do?