Ever since there have been home computers, there have been resource management games. My own first memory of them would have been Lemonade Stand and Tapper on the Apple II. Then of course sports management games, when it's much easier to simulate the statistics of sports rather than the game itself. Even now, the vast game playing majority is utterly addicted to the likes of Clash of Clans and Hay Day. So there must be something in this genre that keeps us coming back (I'm quite partial to Game Dev Story and Cookie Clicker myself...) It's getting to the point where as well as simulations of anything and everything (goat sim for example) you can also manage anything and everything, and Pizza Express is proving that the restaurant management sim is far from dead.