I used the word "Unusable" because that's what it is, if I need to do the tasks I've used it for, for the last, oh, 20 years.
The tool is fine if you have no defined shape to achieve, but is useless for refining traced lines.
Adobe, have you gotten this message? This is MORE than a little inconvenient. It is a crying shame.
This has been discussed at length, and if Adobe AI Dev Team is reading their mail, they already know how bad this "improvement" is, since it destroys original functionalities.
Here is the Feature Request discussion:
So now we wait, and learn to either only use Reshape when CHANGING control point direction, or go back to AI 1.0 functionality and only edit control points individually. :-(