Hypothesis of "least surprise:" Sane defaults implies warning users about impending destructive actions ie deletion), give them a chance (ie grace period, lotsa

Hypothesis of "least surprise:" Sane defaults implies warning users about impending destructive actions ie deletion), give them a chance (ie grace period, lotsa warnings) to change settings and/or pay more money to keep large datasets. Implicit, destructive system behavior is flawed by non-design.