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I dunno about something still... Everything has a construction cost in the form of raw material and everything not (passive as chest or ammo) has an upkeep cost in the form of energy or ammo.
Everything but a few thing like solar panel and transport belt. Solar panels are alright as you need to massively deploy them and condensators to make them efficient as a main power source.
Transport belt... that's the thing bothering me. I m massively using them. I have loooooooong belt circuits to bring raw material (iron, copper and coal) to my main base. And, it's upkeep free! As you can use as many belt as you want without upkeep, you don't have to worry that much about optimizing your building setup or your supply chain of raw material. The only thing you got to optimize is to have enough raw material to avoid bottleneck in supply chain and in a smaller way the use of injector to minimize a bit their energy costs and of course, avoid supply bottleneck.
I don't get why my transport belt circuit should remain free upkeep wise. I won't like them to be directly connected to electricity pole like other building but more in a "fluid" circuit like water for boiler : pipe and pump. With that logic we could keep the transport belt and had a transport belt relay. Each and every belt after the 5th between 2 relay will decrease speed of thoose transport belt by 10%. As such a 7 belts length (relay, 5 belt, relay) will be 100% efficient but a 12 belts length will get down to 50% and a 16 belts will go down to 10%. Of course a more than 16 belts length will just stop moving.
I would like to move forward on this idea by removing the faster belt but adding faster relay! We would use the same belt everywhere but had various base speed for different relay. As such, if an "express relay" is twice as fast as a basic relay, it would make a 12 belts length circuit just as fast a 7 belts length circuits with basic relay.
That's the main idea, numbers and equation are of course just there for a better understanding.
More electricity needed = more polution (or massive solar panels setup) = more chalenge