I pattern match "Quests" in TFA to "projects" in GTD, and "goals" in TFA to "3-5 horizon + someday/maybe list", I don't have time to give nuanced thought to this, but I'm posting my hot take that this looks like a useful tactical method to help oneself take projects off of your someday/maybe lists and work on them, but does not fully address how to make the time.
Wait, no, it probably does, but I'm already running over my break time so I'm leaving this comment here as an anchor to come back and review after work.