One accessory I think is a must (though many do not agree) .. is the prop guards. If the bird were to tilt or hit a wall, it would simply bounce back, and not break the propellers, send air-borne debris, and crash. I'm still flying in P-GPS mode, though I know I need to learn P-ATTI just in case I need to take full control of the drone, in case of high winds or sensor failure.
I understand your concern and probably will get some for areas that would be at more risk. But although this is my first Phantom, I have been flying R/C and less expensive drones for several years now. I'm not one to push the limits of something I can barely afford to buy once let alone have to fix just because I was being careless. #married #kids LOL