Okay I have an idea on how leveling multiple classes can be improved (Regardless if you think it's it at the right peed now, note that they will not stop adding classes at Ninja and eventually it will take months to get every job at the cap)

For every class that is already at Level 50 add a 50% to the experience.

As an example; say wanna level up ARC next, and have BLM at 50 you get the usual 50% bonus (Chain and rested bonus aside), but if you have WHM at 50 as well that bonus becomes 100% doubling our experience, adding a level 50 BRD makes it 150%, lever 50 MNK 200%, etc.

Pros:
  1. Makes it easier to catch up by drastically shorting the time needed to grinding
  2. overworld mobs are actually worth grinding on
Cons:
  1. Because of Pro point 1, actual experience with it will be diminished if you already have several jobs maxxed, meaning that new players that maxxed every job would be good at their main and maybe their first 2-3 alts but will suck at the last jobs they level up
  2. Also because of that entire dungeons may be skipped because players are at a point where they don;t have to do them outside of duty roulette, making the queue times for the dungeons as long they are for post 50 dungeons
  3. Some people will probably think it will result in being like this due to Con point 1 and Pro point 1:


So what are your thoughts on this?