Assuming one can derive a correct input-output table, are there still any reasons to prefer the market to central planning?

The market reflects consumer choice. The input-output table considers only production efficiency. Also, the market can react more quickly to changes in cost and especially to changes in demand. An input-output table is expensive to construct and use, whereas the market doesn't requires a special computer program. Finally, the government would have to decide what will be produced in a centrally planned economy, versus consumers deciding in a market.