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What if I want to roleplay a Communist planned economy, though? I'd like the option to turn civilian mining off. I tried to remove them as they popped but I've kinda relented after it became too much micro.
Problem is that even Communists, even the most extreme ones still have "civilian" enterprises to a high degree (just in a very different nature). You probably would have to play a hive mind or something to completely remove civilian free enterprise. Don't underestimate the power of free will, history are plenty of evidence that free will of the individual will prevail in the end, especially in groups of people where ideas and ideologies rarely are something people will ever completely agree upon.
I have no problem with allowing civilian mining in my communistic type governments in my play through, civilian mining is almost always a benefit and rarely a drawback from the economy at large. Even in a communist government you will never find perfect consensus and rich oligarchs will run their own private enterprises that no one can really prevent as they wield too much political power for anyone to do much about it, they just either pay people to shut up or shut them up permanently...
...this means that civilian companies are basically rich powerful families or people who wield enough political power to practically do whatever they want.
In general you probably would have LESS control over your empire in an authoritarian government as the people in power have to constantly struggle with internal power for control. Law is applied in political power and money and is not as strong as in more liberal government forms. This is why such governments have so much corruption and internal instability.
I'm not against there being a way to restrict civilian mining operations, options is always good. But I don't think human type of authoritarian government is a good reason for it. Even a democratic government cold restrict a system from civilian operation because of some specific reason too, probably even easier than an authoritarian government to be honest if the reasons are good enough.