OK. Will leave you alone then. Have fun posting your ideas and getting no feedback in the future if all your reasons are just "i want it this way".
People hated to level 2 classes for 1 job because it took longer and they had to level a class they had no interest in playing. 2 classes for 1 job REINTRODUCES this problem for a lot of jobs. This is on top of the fact that all added jobs require you to have leveled another job. People dislike this. Just because YOU don't care about it doesn't make this a non-issue. The Rogue -> Dancer stuff (probably among others) makes no logical sense as the class and job have no connection lore wise.
Will use this faulty logic to decrease all exp by 80% across all content. You can also reduce drops! Now you have to run the same content even more to get the same results!
So every MMO starts at level 1 and jobs you can't start with need to have a class attached that starts at level 1 but jumping from 30 to 70 is fine? There clearly is no logic at all in your reasoning.