Wooden planks actually do regularly come with knots and large differences in strength due to the grain - we are able to work around this due to familliarity wit

Wooden planks actually do regularly come with knots and large differences in strength due to the grain - we are able to work around this due to familliarity with them at all parts of the supply chain. As for why we use planks and not logs? They're all the same size - A lot easier to transport and use.