Boeing's proposal was horrible. LockMart at least made a fighter-bomber that could fight. The F-32 would have been fine in A2G, but in air to air would have made the F-35 look outstanding. Plus it had a hard time with ingesting hot gas exhaust.
It's actually a common problem since the AF has been going away from old school oxygen tanks. The OBOGS (on board oxygen generating system) should be capable, but they're having problems with hypoxia.
