Wow. That's a pretty significant reduction in travel.
I've never been a fan of the destroyer in World of Warships for several reasons. Endless amounts of torpedoes is one, the ridiculous ability to vanish right before your very eyes is another.
That said, a nerf of that magnitude especially with no discussion on it is simply ridiculous. I conservatively estimate that they took about 20 degrees of fire angle out.
The real problem when you think about it isn't that they decided to do it, but that if they decided to do it then it must have been ridiculously wrong to begin with.
But that's the same with all things Wargaming: make something stupidly OP, let people buy it hand over fist and play it to death, then nerf the flying bejesus out of it and introduce the next OP vehicle.
They've been doing it since day one. How anybody can be surprised at this point is beyond me.