It depends on task though. Selection is easy to do using eye-tracking as you just have to shift your attention onto the object long enough to click.

Drawing is a task that is more like aiming - attempting to hold your gaze at a precise location for a period of time. It is possible, but you are fighting against the natural saccade pattern of your eye and it becomes tiring very quickly. You can expect fatigue / eye-strain within a few minutes.

> Drawing is a task that is more like aiming

A new platform certainly doesn't have to be better at every task.

Even 20 years ago, a professional digital illustrator wouldn't try to draw everything on screen with a mouse, they would have a tool more suited to the task, like a Wacom tablet.

Agreed I would want to do something like drawing with the eye tracking. I would expect the hand tracking would be used for that.