Then, let's say you open a mine. If you've paid for the mine, you should always get what comes out of that mine absolutely free. It's your mine.
Does "paid for the mine" include "paying for all the mineral extractors, bioreducing lichen, HE suits, food, water, evacuation shelters, etc etc etc" the mine needs on an ongoing basis to continue operations?
If so, then sure, you should get the ability to take any produced commodities without payment (since you're giving up the ability to sell them to someone else if you do) [1]
If a bunch of NPCs magically handle all of that commerce without you needing to consider it ever again then you can pay for any Gallite they produce too.
[1] And in this case, market prices are going to need a serious overhaul so that raw materials aren't significantly more expensive per tonne than refined metals which are significantly more expensive per tonne than manufactured goods and components which are significantly more expensive per tonne than spaceships, or you're going to be making a massive loss on this facility whatever economy you pick for it.
They originally had FC variants (one for exploration, one for mining I believe, etc.) with the concept of support vessels. The original asset shots looked cool, the carriers looked distinctly different from each other.
Then the actual, much trimmed down (visually and gameplay wise) FC design released
Visually, yes.
Gameplay wise I strongly suspect what we have now is a lot better than an "exploration" or "mining" FC variant would be, which would probably have come with a static set of services enabled, including of course some outfitting and shipyard packs of minimal use to most players. The ability to set up your own carrier loadout and only have the bits you actually want is probably far more important than having a nice-looking support ship hanging around it.