One of the primary intents of zones is to provide more long term flexibility to the development of planets. Not all of that potential will be reached in the initial implementations where we're trying to make the systems similar to the 3.x economy.
Benefits that we see include:
- More ability to customize your Urban Districts. Where before you had City Districts and Industrial Districts, with a designation toggle to switch your Industrial Districts between Forge and Factory, we no longer need to create extremely specialized zones for other resources - you can make your picks yourself. Want Research and Unity? Go for it.
- Use that to create unique Zones based on planetary features, to make different planets feel more interesting and unique. In one of next week's beta updates, the Betharian Fields planetary feature will let you shift miner output from Minerals to Energy as a prototype of this. I expect we'll have a lot more as we take advantage of the system more in 4.1/4.2.
- Create a clearer distinction between Districts and Buildings. (Though admittedly we've backed off on this a bit.) Districts provide jobs, Zones change which jobs, Buildings modify jobs.
Amenities shouldn't be a Zone though. The beta's shown that clearly enough already - they need to be provided in a different manner