To be honest, i dont know if you are false or right, both a really large companies. BLizzard focus on some games (Diablo, SC, Warcraft, Overwatch, Hearthstone and Heroes of the storm). Even if now it is "Activision-blizzard" it get in many ways 2 different entities that walk together. But we should speak about this big entity, and with activision there is much more games.
BUT SE is not small (clearly not indie as you said). Final Fantasy, Dragon Quest, Hitman, Tomb Raider, Nier (and previously drakengard) and so much more. Like Activision, SE gets a lot of title they publish (not create). That gives even more money.
What i want to say, we get a size for SE or Activision-blizzard (or capcom, ubisoft and so much others) where the bigger is not the matter. they get more than enough. FFXIV give them really many money. enough to get some stability about this game... but will come back to it later...
https://en.wikipedia.org/wiki/Final_Fantasy_XI
https://en.wikipedia.org/wiki/World_of_Warcraft
2002 vs 2004
So SE is older in MMO business. (And FFXI is not close yet, without being as big as WoW, it continue to live, getting money to the company today. )
This is the main matters. The feel (we dont have proof) that most money we give to FFXIV (subscription + cash shop + retainer subscription + soon app subscription + soon app mogcoins) dont go to FFXIV but FFXV, KH3, FFVII, and any other thing they need money for.
Or the feeling is due to reality... Or due to the fact the team is paid too much for the work they are doing. The matter is not that SE is smaller than blizzard. The matter is how they use their money... simply
TO answer about the voices in WoW, it began at Vanilla (everyone can remember Whitemane resurecting her "hero" or ragnaros saying his famous sentence!) It was not a lot, and we didnt have in game cinematic.
Burning crusade added more voices, and WOTLK (2nd expansion) gave the cutscenes.
The game began with 3 langages (English, German, French). Fast Spanish came. And today, Russian, Chinese, Italian, Portugese, and others, dont have the list in mind. I also dont know if all get voices. (nearly sure to those i did just list). I also dont remember when came which language. but at release, only 3.