I've thought about this in relation to Minecraft as well. In environments like Second Life or modding scenes for higher-fidelity games, the barrier to entry for

I've thought about this in relation to Minecraft as well. In environments like Second Life or modding scenes for higher-fidelity games, the barrier to entry for content creation is higher. It's much more difficult to make something that looks good in comparison to everything else. Adding constraints to that "everything else" actually helps to encourage creativity, by enabling more people to meet the standard.