As a shiny hunter, I need to be weary of Pokemon with explosion/self-destruct and it's just easier to be able to have false swipe(maybe hypnosis or thunder wave) and damp instead of putting it to sleep, switching out and not false swiping at all.
Sidenote: I know I can just save before encountering it and if I fail it, I can reset but I forget to do that a lot and also it wastes my leftover sandwich time.