Increasingly, I encounter in presentations with a round cursor. For myself, I explain this by the fact that with the advent of touch screens the control element became our finger, which when pressed on the surface has a rounded shape. Unlike the conventional cursor in the form of an arrow, the circle also corresponds to other features of the finger: touched the screen - the circle appeared, pressed harder - became larger, as the area of contact increased. Perhaps it is the desire to understandable and universal solutions will help to change the cursor and systematize its behavior on all devices.
Translated using Google