What does PSIA say? Who is your Source of the Truth in PSIA? What is the last National Academy that you attended? When was the last time you skied with D-Team people?
I'll answer.
I went to National Academy at Big Sky not last year because, well, I cancelled, but the year before that and the two previous years before that. I did indeed ski with team members at those events, and at other events. I also ski yearlywith one retired team member for a private lesson. I've only discussed underfoot pressure with one of those people.
But I also ski with local trainers who are not so lofty in the organization and
they did not all get the memo. Now whose fault is that? I'd say that PSIA is partially responsible.
In the most recent Alpine Manual (2014) there's a glossary at the end. In the entries for base of support, pivot point, pressure, balance, and pressure management, there's no mention of where under the foot the pressure might be. One entry does say pressure should generally be in the middle of the ski. That's pretty much under the ball-of-foot when we are talking about standard binding mounts. There is no entry in the glossary for arch, ball-of-foot, balance point, or underfoot pressure. There is no index. I have the print version.
PSIA could print refrigerator magnets proclaiming skiers should adjust underfoot pressure to be at the back of the arch. They could print bumper stickers. Helmet stickers. They could sell bobble head skiers with jerseys proclaiming it for the locker room. How about knitting it into wool beanies? I can see locker rooms with battery driven wall clocks whose faces say BACK OF THE ARCH BACK OF THE ARCH BACK OF THE ARCH (that's 12 words for 12 points on the clock). It wouldn't be that hard to promote this should PSIA decide to do it. People would get the message, even if they didn't like it.