how can a game that came out in 2004 have instanced housing but this game cannot?

[Vulcann]

All these old games that people keep bringing up. How far can you customize the interior of their instanced housing? How flexible is their positioning of furniture and how many different kinds of objects do they have? Those things matter very much when comparing data loads.

there were multiple style of flooring and walls to choose from, you could place furniture and objects anywhere as well as resize them. clever people even were able to make stairs and a second floor with creative placements of items and pillars.