For ages people either the player gets pissed off if they find a useless class 0 planet or they pose no strategic value to them whatsoever.
Well lets end this waste of perfectly good resources and have constructors or space miners (what do you think is better?) to set up a fully automated resource harvest where drones extract whatever is useful from the planet. Perhaps players could randomly come across artifacts or things out of the ordinary in the class 0 planet, or simply they find metals of all kinds that are worth billions or more credits because the resource is high in demand.
Basically hostile races can take out the base of operations with any ship and attack it like a ordinary star base, so they are not indestructible and requires the player to defend it with ships just like any other planet.
Also couldn't resources be part of the game as well? Seriously credits are everywhere but what if they had like a quick statistic of what exactly is being mined, the values of each resource and how many credits are they worth per unit. This could make buildings like stock exchanges play an interesting bonus role to the players economy. like setting up what resources to trade with another empire or what goods could be sold to that empire.
Besides, it would be way better then just having X% boast through technology/race bonus/random floating resource.
I thought this would make way more sense then having cubes or coins floating in space for absolutely no reason... maybe the mines could completely replace mining star bases.
I NEVER said anything about building on class 0 planets, it is that the space miner collects resources there and sends it back to the closest colony. Besides giving the space miner a job of retrieving resources from a class 0 planet eliminates its uselessness once all space mines are constructed.
The resources are brought only to planets with Silos where the raw resources are stored and to be depleted by planets, star bases and space ships across your empire. Failure to mine the necessities of your empire will cause consequences such as shrinking in colonies instead of growing, ship malfunctions, star base shutdowns, lost influence and billions of credits for failure to keep up with the supply and demand of your civilization in raw materials.
Any Excess of any particular resource could be sold on the black market for additional income, and their values are calculated by the percentage of all resources mined.
Making class 0 planet harvesting mandatory to set up these automated class 0 mining operations would also give class 0 planets a meaningful purpose in the game design and not just something to look pretty or take up space just for the heck of it or to piss players off once they find out they are not habitable.