What's missing is George's demand that you should breathe when you need to take a breath.
A person needs to breathe when the body is demanding it, regardless of any method. You are right about the breathing religion, and the people who turn all shades of color under the minimal of a sanchin test have had terribly inept teachers, who should have corrected this breathing flaw in a student early on.
This happens especially when a teacher gets behind the student, punching him and kicking him, while the student is unable to anticipate the blow and tense up or tightly exhale to absorb the blow.
The student doesn't want to get caught taking a blow while inhaling so he keeps holding his breath pressurized without a proper release. We are lucky that so far none of the elder persons I have seen go blue did not collapse.
The "when" for the exhales is a matter of allowing it to happen with movement and forcing it to happen when your body wants/needs a breath.
Right on. And I find that people who have played competitive sports do this naturally, as the body demands it, whereas people who have never done sports have a terrible time on the dojo floor with breathing dynamics.
The biggest problem we see is a student straining with a pressurized abdomen, performing a strike without exhaling, but then emitting a short inaudible tsst and not inhaling as he keeps doing the next move.
Strictly the teacher's fault.