I dont imply that Blizzard has to voice over all the quests.
But take for example now with the Broken shore and Kadgar quest, its like 50% of the content is voiced over and other is just plain text, it makes for a weird experience to expect voice and then the NPCs are just spewing text, even some important NPCs.
Doesn't it feel like a unfinished product? it seems they plan badly and only voice over half of the content
There was other MMOs that are fully voiced over even f2p ones.