Because in real videos where blurring is done by physical processes there is too much additional noise and uncertainty in the blurring process. Unblurring is a

Because in real videos where blurring is done by physical processes there is too much additional noise and uncertainty in the blurring process. Unblurring is an extremely ill-posed problem so any noise or modelling errors get massively amplified. In only works in this case because there is essentially zero noise, and the correlation between source frames is an exact move. Yes I would stake hypothetical customer data on this.