I would have liked single different quests for each weapon more, but that would have been too much work, they have limited resources and chose to spend them into developing new animations.
There's also a quest to unlock them, but it's a single one you need to gain access to the new category.
Overall not bad, still better than having them bound to rare and exclusive weapons.
They also made them widely accessible to a lot of jobs.
Examples? SAM on Archery, THF on Markmanship, SAM and WAR on Polearm, MNK on both Club and Staff, etc.

You'll see me whine quite a lot about the current category cap though, will be really hard for me to pick just 3 of them... Really hope they're going to increase it to at least 20 sometimes in the future.