P.S. If you need forced pressure O2, to breathe at 40,000', then the pax are in real trouble with their dainty little masks. Which just demonstrates that you are completely wrong. So please provide some evidence, or apologise.
Why should he. You are the only one here claiming that no forced pressure is needed at high altitude when wearing a mask. Other people provided much more complete and authoritative postings than your, and to these nobody objected. Go back and read them.