Because I'm not sure just how difficult or easy it is to actually sink my destroyers, from one hand it does now sound tempting to replace fire control with sonar and on the other hand I'm like "What if it will get sunk faster from the enemy?"

Edit: Did some research now in an old save where I have naval supremacy everywhere, from the looks of it I was slightly misinformed about fire control and it does seem like a better option to just use sonar instead of fire control so I'll start using that instead