Stardiver is meant to be an upgrade from Penta Thrust for jobs that want to mess around with Polearm. It's to bridge the gap between Penta Thrust and Drakesbane for non-DRG jobs that can't use Drakesbane. All of the new WS are meant to bridge gaps between jobs that can't use the strongest, non-empyrean WS. Requiescat for sword jobs that can't use Vorpal/CDC, Stardiver for jobs that can't use Drakesbane, Realmrazer for jobs that can't use Hexastrike, Resolution for jobs that can't use Spinning Slash, Upheaval for jobs that can't use Ukko's Fury or King's Justice, Apex Arrow/Last Stand for jobs that can't use bow/gun WS without /RNG or /COR etc... These WS are not job specific. That's like THFs getting upset that DNC does more damage on Evisceration than them. These WS are technically WS you learn from skill level that we happen to unlock via merit points.