Listening to the Devotees playtest was almost like taking a class in module design--you could really see the rules coming out: existing social conflict (including established factions and outsiders), a timetable (but with plenty of lead time for planning), the existing players in the setting have their own motivations and plans (and they will play out unless the player characters interfere), clear and objective standards of success (but many come with a cost), challenges in different arenas (combat, social, technical).
Kudos.