By and large there are generally two types of players.

Those who put in an effort and those who do not.

Leveling in this game does not require much skill. People can level jobs from 1 to 90 without really having a firm grasp on how they work.

People can also do a story skip and spend a few minutes on a target dummy or reading a guide to see how their job works, and get a handle on it before jumping into content.

There are bad players who didn't skip and great players who did skip.

Making someone do Hall of the Novice etc on a skipped character isn't going to make them good at their job. This would just be wasted effort imo. People will either put in an effort to learn a new job or not, and skipping or not doesn't have that big of an impact on that.