See, there's something people are failing to understand.

The developers want to make FF14 as unique as it possibly can. Make it their game, their baby. They can't do that by "borrowing" ideas from other games, especially from FF11. If they wanted to do that, they may as well just make a FF11-2 with a new skin. Sure, they have some similarities of course but they can't outright use the same exact system from another game and say it's there's. It would also require an entire rework of the job system as it is now, and expansions are typically used to introduce new content, not a new game entirely.

As much as you may way this game to be like others in the same genre, I don't see them implenting any kind of change to how the job system currently works.