I’ve seen this sentiment so many times about TWW but have yet to run into quite literally anything not behaving properly other than things they’re openly posting about.
The AH being one of them.
But to answer in genuine faith, it’s because in closed-environment testing like the beta and PTR, there’s nothing for it to combat and potentially run afoul with for existing coding in the live game. In testing, it seems to have returned mostly-favorable performance.
As for the AH, they are aware of the situation already and will post updates in the thread they started in General Discussion: