As Adobe is the leader in the field, I don't understand why you do not provide the same tools as other very simple and less aknowledged Apps like SketchBook (which was for free some years ago, just saying...).
For example: Ruler, Ellipse, French Curve, Symmetry, Steady Stroke, Preditive Stroke and so on.
I get frustrated to have to import my Photoshop work in Sketchbook to do some stuff that I could make in Photoshop itself.
Please add this simple tools, I think that a lot of users would be very happy, like me!
Thanks,
Ele