When WoW first launched the two factions were pretty distinct, but over time the prevalence of neutral factions and addition of new themes to each side has resulted them being more similar.
What would be a good way to keep the Horde/Alliance faction split meaningful and interesting? What are some ideological / thematic aspects that could be identified more with one side than with the other, even if they stay present in both?
For example, even if both sides have Technology and machines now that Gobbos are in the Horde, it doesn't necessarily mean they have to use it in the same way.