Because bulk transport, even including the cost of occasional sinkings due to liquefaction, is cheaper? See also Glückauf, the first tanker designed to transpo

Because bulk transport, even including the cost of occasional sinkings due to liquefaction, is cheaper? See also Glückauf, the first tanker designed to transport oil directly in the hold rather than in barrels. https://en.m.wikipedia.org/wiki/Gl%c3%bcckauf_(1886) https://en.m.wikipedia.org/wiki/Gl%c3%bcckauf_(1886) I suppose in addition to the measures described in the article, bulk ships could adopt cargo holds divided into more subcompartments (including longitudinally, to reduce risk of capsizing) , similar to tankers.