Being rational would be that we all could agree that they finally do more voice overs as they promised us. The amount of voice-overs since Heavensward is almost the same. (subjective feelings)
GW2 can manage to do voice overs for their most important quests with their 3-4 month patch cycle (which includes the living world quests which are like a MSQ) they also give random npcs with no quests for you a voice.
And i dont think GW2 has way more revenue or even more net income than SE. GW2 is also distributed in several languages across the world. ESO has voice over for every quest even if they arent MSQ. And im sure this game gets also new quests every few months.
And here as well i doubt ESO can beat FFXIV in terms of revenue or even net income.

I stand by it, the last quest was a development choice to be lazy imho.