Incidentally the day I started to notice this trend is when I realized that all that old school whine about "voicing dialogues being a waste of money" is tragically outdated. These days it's something expected as a baseline. And frankly unless your game bombs for plenty of other reasons it's something basically that repays itself, for how it expands your user base.
Good voice-over is HOW to good writing's WHAT and on some levels it makes a good voice-over as important as a good writing. There are lots of characters in videogames and movies, who are insufferable, disgusting or outright evil, but their voices make people like them or at the very least sympathize with them. When an unvoiced text tells you that a certain NPC has a deep pleasant voice it simply doesnt affect you the same way when you can actually hear that kind of voice.
