In a WOT situation you have no time and your automatic reaction is life preservation which means both feet on clutch & brake and steering the car if possible. Unless it's happened to you a couple of times then you are generally not prepared and would not automatically hit a kill switch before something happened. If you do hit something and the engine is still running and maybe you are unconscious then you're in trouble if you don't have an inertia switch. Most modern computers have an inertia switch built into them so a lot of vehicles here are ok in that respect. So if your vehicle runs a factory LS or Ford computer then you should be right, your computer will shut down the engine & fuel pumps upon impact. There is a reason manufacturers build these things into computers. You will then need to reset that switch before it starts again ( I think). Nothing wrong with an extra
oil pressure switch to save your engine but you can't be 100% confident that in a split second you will have the ability to hit that kill switch.
Just my 20c worth.
PS thank god I haven't had a WOT situation but have had 2 cars I was driving spear off the track on
oil and I probably had 1 or 2 seconds to react and my hands were firmly on the wheel trying to avoid a crash.