The only time I've ever completed a game is when I made giant 80x80 cells served only by trains. Each cell was dedicated to a single recipe, with vertical train

The only time I've ever completed a game is when I made giant 80x80 cells served only by trains. Each cell was dedicated to a single recipe, with vertical train stations on the left for inputs, vertical train stations on the right for output, and beaconed factories in the middle. Each cell focused on executing the recipe as fast as it needed to to fill up the output station faster than it could be drained by other cells' input trains. If something was being produced faster than other cells' trains were draining it, then it would back up and stop (and even shut off power via a switch logistic-connected to the output chest). If something was being produced slower, 80x80 is plenty of space to add more factories till it isn't. Near the end the bottleneck was actually how fast I could ship ore from the faraway mines to the smelter cells (I built it organically so all the smelter cells ended up near the center, while the ores were coming in from the outside), but at time I was launching one rocket every few seconds so it didn't really matter. Building it took multiple days because I only built out one or two cells a day, but the freedom from having to think about belts and ratios was worth it. I did not have to worry about prioritization because if one cell needed an output more than another cell, its trains would implicitly be coming to the output station more often. With belts you can end up with a situation where, say, the demand for green circuits is high but your iron plate bus only has two lines dedicated to the green circuits factory area, and there's no space to add more lines. With trains I would just add more factories to the green circuits cell, and its iron plate input train would automatically start running more often without me needing to do anything to it. Unfortunately that experience has spoiled the vanilla game for me. Every time I try to play I remember how easy it made things and don't want to play any other way, but I also remember how many days it took to build and I don't want to repeat it.