I'm not sure I'm at liberty to share production details, but I'd say that the Pareto principle applies here 😄
As for the number of quests, the question is what qualifies as one? There are dozens of stories in the game that can be perceived as a quest, and multiple one-off unique interactions or just outcomes across the game world. Some stories have multiple outcomes, others are just something to discover. Some are important for the future of the mercs and the fate of Grand Chien, others will just serve as means to an end - granting Loyalty, money, resources, XP, unique items, and sometimes, a game experience that makes you smile or contemplate.
From what I've seen as feedback so far, it seems that people are happy with the content density. Moreover, they tend to discover cute little things even in their third playthrough, and they're excited about that (even the "evil people"!).