Yeah it's a long overdue change. Maybe not ACTUALLY making it all all-job equippable, since that confuses the leveling process of gearing a lot, but a common suggestion and indeed the way that FF11 did it is that if you have a job that can equip a piece of gear, then you were fully free to use that as 'glamour' in that game on any job you like.
Anyone with a Dragoon at 80 should freely be able to glamour any piece of Dragoon equipment in the game (sans weapon obviously) to any other class at their leisure, and so on and so forth for every job.