I think one of the big issues is there just isn't the need for accurate long-range fire from ship-board guns like there were in World War 2. The eletro-mechanic

I think one of the big issues is there just isn't the need for accurate long-range fire from ship-board guns like there were in World War 2. The eletro-mechanical systems used on various warships during the war were accurate enough that other environment factors became more of a problem than the fire-control system. Improving on a system that was already the peak of performance is difficult. And this is made even more difficult when long-range gun accuracy is less of a concern because naval guns are no longer the only weapons available to a warship. Missiles have become so common and powerful that modern warships have little to no armor protection. Point-defense weapons like Phalanx are used instead. There is still a place for artillery, both naval and land-based. It's just a smaller role than it was a hundred years ago.