I don't know if this has been suggested before or not or if it's been suggested to the Devs already and subsequently rejected, but had a thought to hit two birds with one stone.
That is to increase interaction with artists outside of the team to the team, while garnering a bit of 'immortality' of having their designs potentially in game. While also filling out some of the missing content from previous expansions comparatively to a new jobs release.
In short, why not open the design contests to that of previous trials, raids, relics, ultimates etc for jobs that don't have weapons from said content. Hold one every three months or something where in one contest the focus is Ifrit, then Garuda, then Titan etc right down the list.
This would:
1. Give those that are artists a means to further show off their skills
2. Keep Dev artists from having to do iterative designs for back logged/old content
3. Fill out some of the missing weapons from previous content
Just a random thought during a hygiene routine.