Questions on leveling

[Bixby]

Also, if you level one class to 50 you'll get bonus experience when leveling additional classes, so that's worth considering if you're planning to level multiple classes to 50.

You don't need to level to 50. You get the same 50% bonus on any class that isn't your highest level. Doesn't matter what your current level is, doesn't matter what your highest level is, just that current < highest. (Edit: Where does this keep coming from? Is the in-game help still wrong? Or is this particular bit of collective misinformation just that hard to kill?)