Honestly, there needs to be a healthy mix of boss/dungeon drops, GC gear, and crafted equipment all vying for BiS. XIV is balanced around progressing multiple jobs, some of which have multiple roles. When leveling a second, third, or forth job, gearing each one the same way would get dull rather quickly. If you need to raid to gear your DPS, craft and meld to gear your mage, seal farm to gear your tank, and perhaps hamlet for your crafting classes, well, that keeps all varieties of content relevant, while cycling players through each one.