You're right, the Apollo 1 was significantly higher pressure. Didn't know that. 😲 Makes somewhat more sense they could keep a pure oxygen atmosphere even after the accident.
Also, calculating partial pressures in psi is really annoying.
With 100% oxygen you will be fine down to 4 psi or so. Mixed gas would need substantially higher pressure and that would likely make those suits too stiff to move.
Never forget his goal at the last minute in the match against Germany.
https://youtu.be/QXOKsJViHtY?si=zdBzySg84JLpz0Bk