Thank you for considering that addition.

Yes, the intentional use of shearing can be quite an esoteric action. But, from experience in the 2D world, those times you want an interesting "slant" on something rears it's ugly head when you least expect it.

In the case of correcting unwanted shear, I deal with that on a constant basis when working with oblique fonts and logotype creation.
The best way I was trained (and the course that makes the most sense) is to first use Skew to get it to something as close to straight as possible, then work on Aligning points and curves.

MoI's on-the-fly construction guides and Alignment functions are crucial for OCD driven designers such as myself. ;-)

Mike