Building tall does not mean remaining small. If you want to build living space for 100 families you have two extreme options with everything in between being possible as well. You can build 100 individual houses, which requires a lot of land or you can build one skyscraper with 100 floors. Each option is viable depending on the circumstances. If real estate is expensive it's better to build tall, if it's cheap then wide is better.
In terms of Stellaris this means you could either grab any opportunity to expand your borders or you expand by terraforming every planet you can, building habitats and ring worlds. I would love it if you could settle moons, asteroids and barren planets as well, and increase the number of pops that can live on a planet.
In terms of Stellaris this means you could either grab any opportunity to expand your borders or you expand by terraforming every planet you can, building habitats and ring worlds. I would love it if you could settle moons, asteroids and barren planets as well, and increase the number of pops that can live on a planet.