I wouldn't bother trying to make sense of why this was nerfed. I'm almost certain it's a random darts-at-dartboard change, like the majority of class changes and reworks they do.

Their reason is probably something nonsense like "we don't want dungeons cleared too fast" or "we wanted faster movement speed to be phys ranged exclusive". Trying to draw logic from this is futile. The devs do not follow logic.