Agreed
However if flying along fat, dumb and happy at 41,000 and suffer a sudden depressurisation, useful consciousness circa 10 secs, would happily be eaten up by memory items and "oh sh#t factor". Start emergency descent -with structural uncertainty, thus not increasing speed. It would be handy to have faith in a system that could work at an altitude of greater than 40,000?!
As I say, I believe there is a logical reason-there has to be.