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True, but don't forget that in order to maintain that certification you have to dish out additional cash to go to the necessary "psia clinics". It's not like once you have it, it's all done and over with. I think you need to clinic at least once every 2 years or something.
I'm pretty sure criteria for psia have stayed pretty consistant over time even with shaped skis making their debut, but someone with more info can chime in. Psia for park is fairly new obviously, so that's a recent installment (whatever the name is). It would be interesting reading through
when you spend almost every single day on the snow, when you like to ski really extreme terrain, and when you make your living by teaching others how to ski, then proper technique is super important. if you are just some gaper that skis one week a year then it isn't all that important so long as you are able to maintain control so that you don't hurt yourself or others.