This fails to occupy the same umbrella for a number of reasons.
- Spec'd jobs usually share skills that work in various ways upon spec
- In FFXIV you can only gear one job to max at a time, which limits you from swapping builds for different encounters
- Swapping jobs does not give you any sort of customization, skill building or theorycrafting.
Fundamentally, they are different things, and appease different people.
Interestingly, it is actually easier to have multiple classes at max level in raiding in other games, due to the fact that you are not locked in gear per class. In this game, you're encouraged to play everything on one character, which then caps your ability to gear multiple jobs. So, in addition to other games providing more customization within each class/job, they also enable you to play more than one job more easily.
