
Sounsyy put it best (as usual/always when it comes to lore) but I want to emphasize that those changes didn't come in 2.0. The original 1.0 release skills got changed in (I believe) the 1.18 Class/Job change update, which was the first big sweeping change that Yoshi got to drop to try and patch fun into the game. It's not as if we all got timeskipped and found a new skillset, it was literally an overnight change where you woke up with a whole new kit upon log-in.