I'm surprised and disappointed that nobody mentioned this yet: The main side missions in Greedfall are actually a parallel story going along the main game. And they are required to get a true ending of sorts. I don't even see the side missions in this game as side missions. They're that good.
The game is so heavily inspired by the ME1 formula that honestly it should get much more love. I'm excited for Greedfall 2 as well.