At the top of my list is Factorio, and second is actually World of Warcraft.
More generally, there is a lot to learn from game design that you can learn through playing. The question of how to make taxes palatable, for example, is really no different to the question of how to challenge a player without frustrating them.
I believe the value of games are poorly understood, partially because chess, a game that has nothing left to teach us, muddies the conversation