FFXIV was originally designed to allow you to grow vertically from 1-50 with any class on your own time ,solo or party. Now FFXIV will only allow you to remain on 1 class 1-50 through party play. Getting through solo play requires you to work on yourself in a horizontal fashion grinding multiple jobs at once and unlocking spells such as cure & sacrifice for your melee classes. Single classing requires full time banding pretty much at this point.