No-one else, or at least as high profile, was doing AI voicework in their games. Embark were essentially the first with The Finals.
One successful game/studio doing it opens the door for other studios to start doing it.
It’s better, yeah. But that doesn’t mean it’s good. Ideal would be them simply paying for a voice actor to record all the lines, which in the case of Arc Raiders they now thankfully appear to be doing.