To treat an aircraft in the same way as a car in terms of safety equipment is wholly wrong if you intend to go any distance when the weather might turn bad.
Erm, if I'm going off somewhere in a car when the weather might turn bad I do take survival equipment - no fun even being stuck in a jam on a motorway in subzero temperatures in your shirtsleeves, let alone a breakdown on a country road with no mobile coverage.
I do the same in an aircraft - take what's appropriate according to my risk assessment for the trip and possible weather.
(My father always carries a spade in his car in case he has to dig himself out of something - and I've seen him use it (albeit to help another motorist rather than himself). I have twice got stuck, once in mud and once in sand, and felt the lack of a spade ... they don't come as standard with hire cars!)