Why should we? Affinity has several ways of doing many thing but with cropping there is only one way, non-destructive. I have been using graphic programs for years and most had destructive cropping, Photoshop changed that for me so I could choose what I wanted. I would switch between non-destructive cropping and destructive cropping as the situation demanded with just a click of a tick box. With Affinity destructive cropping can be done but the method is neither quick nor simple.
Posts in this thread say no one wants or needs destructive cropping, that is true if you discount everyone that WANTS and NEEDS destructive cropping.
Come on Serif, add this facility, a check box has to be better than possible users being deterred by the lack of a very basic function in an otherwise excellent program.