If that was the case, then:
1) They would take feedback more seriously.
Writers generally don't take criticism well.
2) They would have less pop culture references thrown into the game.
I'm sure they enjoyed writing those references into the game.
3) We would see less modernization of the races.
When Modernization happens, it tends to happen fast. Sad, but true.
4) Language would actually be a lore issue instead of just a gameplay one.
"Ah, they speak the universal language
; English." - Nail Dragonball Z Abridged
5) We would know how all the various cultures actually work, instead of having moments that are frankly embarrassing on Blizzard's part like when Thrall's "marriage" consisted of an informal "be my life-mate" moment where the novels already claimed that the Orcs had an actual ceremony that had to be scheduled for such an event.
I'm sure all the writers involved with that debacle were very serious when they wrote what they wrote when it was written. It sucks that what was written earlier was summarily dismissed when a contradiction was brought to light, but it happens.
I mean, you look at another RPG like Dragon Age or Skyrim and the writers have all their stuff figured out. They made up a fictional language for Skyrim's Dragons, and the writers knew how everything worked in Dragon Age's society right down to how different cultures viewed same-sex relationships.
Yes, clearly what we're lacking is a detailed account regarding the mating rituals of Orges...!
Seriously, I love fluff, but more than anything Blizzard is guilty of contradicting itself and using a shovel and an axe when writing their lore instead of a spade and a pair of trimmers would more than suffice. They're far too readily dismissive of the lore that's already been written when alot of the time a small tweak is all that's necessary for things to make sense.
Point in case, Thrall and Aggra get married! When it could have been instead Thrall asks Aggra to marry him with a ritual or ceremony to later take place. I don't think you'd even need to change the quest line or dialogue for that to make sense.
Again, I do think they're serious about what they write, but maybe they're too serious about what they write and aren't too serious about what someone else wrote.