I just played a lot seven days to die and Elite Dangerous and got the idea of having very different worlds on same tiers, but with different pros and cons coming with their differences.
I would like to have worlds that a true harsh in the matter of survival, thinking of thirst, hunger and the need of shelter to avoid being caught by the fierce inhabitants.
Those worlds then could have low resources of food and water, may be even filled with grounds that cannot support farming (or only some small plants), but have some rare treasures or more ores then balanced worlds.
On that way people would have to work together and plan their approach, which then may give them access to ressources that they can use to craft for their own or to trade to other worlds, while people of more friendly worlds could establish trading routes to those worlds to support them with food, water/drinks and other stuff which may be needed there (may be even wood, tools and weapons if they are really rare or hard to get there).
On that way people who love harsh survival would have a place to be while others can use them to trade, which would encourage the economy aspects of the game.
What do you think of that idea? Would you like to play on those kind of worlds?