I never really had a 'main bus' like this.

My main production centers were all more dendritic in nature -- from raw resource to finished product, never sharing anything with any other finished product's production line. If two different finished products needed, say, green circuits, then I would have two green circuit production lines to feed each of those independently, and so on and so on, all the way to raw resource extraction.

(And on my second playthrough, also just an absolute ton of logistics bots flying around. Thousands of them. Did you know that you can make an assembly line for them feed right into a robo-port? I just constantly had more logistics bots being added to the logistics system at all times. Anytime something needed to get from somewhere to somewhere else in relatively low volumes, it was provider/requester chests to the rescue, and then just let the massive bot network handle it.)

But I suppose one big benefit of doing things this way is that I would rarely have huge lines of parallel conveyors like this. Most conveyors were only singles or doubles, at most.