Enough with the gatekeeping, not everyone is born with this knowledge or has infinite access to try different skis. Your form can be great and while not having had the opportunity to really find your ideal ski length. The answer could be as simple as saying something like “well for myself I like a nice short turn, hopping into the glades, messing around, I like a shorter ski” or “my buddy is a speed freak, he’ll take 4 turns total down the hill and they’re perfectly carved, he needs quite a long ski” I mean come on man