I JUUUUST learned a basic Satisfactory skill that everyone else probably already knows, because I played so much Factorio I went in with the wrong concept.
In Factorio, the concept of a main bus has such power because things fill up. Things stop. So while things near the front of the bus have resource priority, they only produce what they need, and when they're done, they stop.
Satisfactory isn't supposed to be like that, and now that I know that, things are going great.