Why naval guns retain rifling

Why have naval guns not returned to smoothbores as tank guns have?

Naval guns must remain accurate over much longer ranges, though guided ammunition could eventually change that tradeoff.

Naval guns are expected to fire accurately at much longer ranges than tank guns. That range difference is the reason given for retaining rifled naval weapons. Greater use of guided shells is suggested as a development that could bring smoothbores back. The prediction remains conditional on changes in ammunition.