Just in general, that there's a lot of stuff to do. I can make a base and slowly do various upgrades, try to finish the game as quickly as possible, or just fool around in creative mode.
myself i only play minetest on a public server without attacking mobs, so there is no hurry to build a base, and i can focus on building interesting stuff. i still have to get food, mine for materials and fix my tools so there is plenty to manage while building. and with other players on the server we can also build in collaboration.
my son likes to add mobs, so he is building and fighting mobs.