There's a great variety of systems but all of them lack depth. It's fun to spend one in game day farming, then foraging the next day, then mining, then bug catching, then fishing, then decorating the town, then fulfilling villager requests, then cooking, then crafting, and finally playing a card game. However, any time I tried doing the same thing in game for just three days in a row I was just reminded of how simple each individual mechanic is. As long as you force yourself to play with variety it's a fun time.