They didn't even necessarily nerf it, they just disabled tax stance. I'm certain tax stance was an oversight by the devs considering you were faster than tac sprint on a full mobility build + more accurate than the normal ADS, which is completely dumb
That is true, I am just bummed that I was never able to use that while it was overpowered like that. It is still really good but essentially with this build you need to utilize your normal sprint capacities which is still extremely fast just not as fast as it was with that bug.