Mostly, “the grind ground you down” category.
At this moment I need tons of gems to power up machines. Gatering gems for mass production (more than 300) is taking tons of time. I dont have it cause of work. For hour of mining you can find 0. So u need at least 3 hours in a row. And even it doesnt guarantee that you’ll find anything. So… I often dont even log in if I dont have several hours for the game. It happends not so often now. And when I have time I prefer games that provide faster progress and where I can play with friends.
Farming gleam takes tons of time also) but at least you can find several blocks for one hour.