Whenever games sort of borrow and assembly from other places, it seems like doing so obsfuscates the fact that each game is unique and is composed of many different variables, some of which are supposed to work together.
In many ways something like Fallout with it's engines was built for more combat, hence, the volume isn't such a big deal.
Dragon Age was a tactical system that became more of like a slush sort of thing.
While I do like the combat of Fallout 4 (and the settlement building), I felt that it came at the cost of things I found fun about Fallout 3 and New Vegas which were the more detailed skill/perk system and the frequency of that system to affect dialogue or quest options, more conversation options in general, and the ability to be evil. I also felt fun sidequests were few and far between in FO4 and the game was mostly filled with the boring radiant type quests or quests that were barely more detailed and unique.
I don't know what a "slush" is but the reason I didn't like the combat in DA:I is that it was so limited. That style of combat isn't my favorite to begin with but if I have lots of options in combat: lots of abilities, creative ways to use the terrain, things I can do to prepare the battlefield such as set traps, dig trenches, build barricades and similar, lead enemies to a different group of enemies and wall them in with each other and have them fight each other rather than both ignore each other and fight me, and so on I will have fun with it. DA:I's combat looked like it could be something like that but it fell way short of my expectations. Not only were the things you can do limited but your abilities were limited and unchangeable during combat for no reason, you couldn't switch weapons in combat, and at least in my game the AI was horrible and did stupid things when left alone yet disregarded my commands when I used the "tactical" mode. I felt like I was fighting restrictions and crappy AI more than I was fighting enemies.
I think a lot of how much someone can tolerate some shallow quests is related to how much they like the combat and gameplay mechanics of that specific games. If you like it, those filler quests can be an excuse to do more. If you don't then they're something that forces you to do something you already hate in addition to having nothing fun or interesting to add themselves.