It seems to me that DDs were sold on their stealth capability. Now that the smoke screens total number has been reduced and cool down has increased severely, it seems that WG is taking the ship class in a whole new direction. But faster speed does not equal survival in a map that requires ships to travel long distances in the sight of enemy ships (a fact that longer smoke screens addressed successfully). Also, this change is removing what made this ship class unique and therefore homogenizing all ships thus making their game more bland. Now it seems that DDs have to camp near land masses to successfully launch their torpedoes or camp at long intervals waiting for their nearly useless smoke to reload and then attempt another attack. This change would seem to eliminate the DD as a dedicated front line ship and cause the DD captains to spend more time in hiding out of the fight.
This may be a case of fixing something that was not broken.