Animation Curve Editor: No immediate play-head "scrubbing" possible

When moving the play-head of the timeline editor, the animation updates immediately. Even the play-head inside the Animation Curve Editor (if it is open) follows in real-time. That's nice. Is that what professionals call scrubbing?

The other way around, when moving the play-head in the Animation Curve Editor, the update happens only when releasing the play-head. It does not give immediate feedback regarding the animation. That makes it IMHO more difficult to tweak curves.

I don't see a technical reason for having this unsymmetrical behavior.

Screenshot (or it did not happen):