This is present since her release and people have been abusing it more and more, as this considerably reduces the delay between reloading and shooting. While reloading, you use hello emote (bound to a shortkey), so Ashe will immediately stop reloading animation to wave, and then you’re free to take any action as anything can cancel the wave/hello animation. This would be legit if it didn’t involve voiceline spammming. lol
I’m pretty sure this is not intended as no other hero can cancel animations with hello emote. Instead they just say the voicelines if they’re stuck in another animation and can’t wave.