At the very least, they should have something for the base concepts of each class.
Then they can give explanations on this without going into each skill and could avoid the issue when they prune skills in the future.

Something like this.
SMN: Egis, trance and demis.
DNC: The concept around the steps and when the dances draw on.
RPR: The avatar and enshroud.
DRG: Jumps and Life of the Dragon.
NIN: Mudras and ninjutsu.