I haven't noticed any difference after settling into not using the gap closer for damage, imo, pre 100 GNB feels the best to play out of all the tanks, the rotation feels very fluid and satisfying.

What I think has changed your opinion is the nature of the gap closer, it is far, far less responsive then the old one. With Rough Divide, you'd click it, then insta dash to the target, it felt good to use if you had thf opportunity to use it to close gaps because of how snappy it was.
But this new one feels sluggish, there's a delay at the beginning and end of the dash, you don't seem to even go straight to the target but stop a foot away from them and it all feels really bad.