I've been thinking lately and came up with theory. I haven't read Chronicle so maybe a lot of this is just wrong and total miss but nevermind
Instead of IMO boring story of how Void is bad and Light is good I've been thinking along these lines:
From Chronicle cosmos chart we can see that the reality is product of interplay between Light and Shadow-Void. The four cornerstones of chart are Life, Death, Order and Chaos. For my theory to make sense I will call Death and Chaos lesser aspects of Shadow, and Life and Order lesser aspects of Light.
What if the purpose of these cornerstones is to keep interplay between Light & Shadow balanced so no side prevails in eternal conflict. Death balances out Life as if there's no death, life would suffocate reality. Same for Life, if there's no Life, Death would make reality just an empty husk. Order which can be percieved as Stasis balances out Chaos which can be percieved as Change and other way around. You can now see where I am going with this now.
Void creatures are embodiment of Void and two main characteristics they represent is Change and Death which is evident in their shapeless, neverforming bodies and their need to devour/destroy.
Naaru are embodiment of Light and two main characteristics they represent is Stasis and Life which is evident in their expresionless, ever static bodies and their will to nurture life.
Now I go into kinda headcannon part but listen
Purpose of Titans is to bring Order(Stasis) to worlds/planets around the universe. Purpose of Demons is to bring Chaos(Change) to worlds they war with (Just look how much Azeroth has changed thanks to their direct or indirect actions...). Titans are stronger than demons yes, but I consider it balanced out because titans are few in number comparing to demons and also weak to Fel so they can't stop demons on all fronts and save all the worlds they ordered.
What if Sargeras by killing Titans and creating Burning Legion unintentionally caused cosmical imbalance. What if right now Void has the upper edge over Light thanks to Sargeras removing one of cornerstones (Order - Titans) which is needed to keep eternal conflict between Light and Shadow in check.
What if we can save all reality only if we replace the role which was missing for millenias. What if the only way to save reality is to awake Azeroth the Titan who will fill the cosmical role which is long forgotten and which dissapeareance is giving Void edge over Light.
What I like most about this is Light isn't force of Good and Void isn't force of Evil. It's all just perspectives. Just imagine a flipped version of the story where Azeroth(Stasis) killed Sargeras(Chaos) and Light is having the edge in conflict. From this perspective Void Lords would be "good guys".
I know this may be wrong on so many levels but tell me what you think about this theory