Okay, you're trying to compare the two again when they're not even the same kind of game. One being an MMORPG and the other a single player RPG. Bethesda hires people to write story because the series has a rich history and the games rely heavily on that. If they stuck to having a couple of "in house" people write their quests then they would more than likely end up making mistakes.
Delteria is not a game with deep roots that dates back to 1994 nor can it draw it's lore from 5 games and multiple books. Delteria was a mildly popular server on a game that wasn't even on the radar at the time.
Also, not every RPG hires writers to do their story for them, so you should probably stop using Skyrim as some sort of standard when it comes to RPGs.