HBar has a major, fundamental difference from DragMode. Sometimes deforming a curve or surface so that a point on the curve or surface is at a particular location and/or deforming the curve or surface so that it has a particular normal direction at a location. HBar can do these while DragMode cannot. And HBar does this while moving the minimum number of control points necessary and keeping the deformation as local as possible.
HBar is not a tool I use for general curve or surface design and modification. For that I usually directly manipulate control points, either by directly moving the control points or using tools such as Scale/Scale1D/Scale2D/ScaleNU, Rotate and Shear. I also use CageEdit in various ways to manipulate curves and surfaces.
@lander My recommendation is begin learning HBar by using it on curves, and then move on to using it on surfaces.
Ahh yes, this one is on my list for future exploration as well. I’ve seen amazing custom stuff relative to this in the forum. I’ll need to research this again soon.
I’ll keep this in mind, and will certainly put some time into sharing my thoughts.