DERP for patrick being in his high horse about not turning permanent death off, but then shutting his 3DS off every time someone dies and restarting the chapter.
I play the same way, but it does add something casual does not. It adds tension. Even though I know I won't lose characters in the end, each move could still destroy my chapter progress. Casual mode would just be me sending units into a fray and not giving a crap because as long as I make it through a mission, everyone's fine.