Time to beat a dead horse!
With the upcoming update to legendary weapon DMG, the time seems riper than ever to add post-RoZ jobs to Relic weapons. As it stands, a 35% buff to DMG and 50% buff to relic/empyrean bonus stats will put legendary weapons on top for most if not all jobs and setups, and leaving post-RoZ jobs without a shorter way to obtain a superior weapon (that will still usually be inferior to the Mythic weapon they can already obtain, if balance is the concern) seems pretty unfair.
I think the buff to legendaries is a great idea in general. I just wish it were something all jobs could benefit from equally.