If the earth is flat, pipelines can run up to the edge. We haven't determined if the earth is a rectangle and how gravity works on the edges.
If the earth is round, then the pipelines curve around the earth.
If the earth is a rectangle, then the pipelines may have to turn at acute and obtuse angles. Sharp angles in pipes can lead to clogging.
There are many more true descriptions of the shape of the earth.
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