You can tank swap in Sword Oath just like both the other tanks. The OT just has to stop spamming their hate combo like a retard.
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That extent of enmity lead is probably only necessary for not-as-well-geared-as-they-think "must solo-tankkk!" tanks in Midas normal who don't realize they will die and will take a lot of healer mana and dps with them in doing so, or are outright not paying attention to swap timings.
Had an all-Grit DRK co-tank in a A6N who would Power Slash whenever she didn't have enough mana for DA-SE, or didn't think she needed the SE self-heal. Oddly enough, this timed out to her almost only using it when she should have been swapping out, or as OT. By the last boss, a healer and I had finally fixed her gameplay via mid-GCD advice and sound effect commands... But I can't think of any other time I've really needed Steel Cyclone just for the voke.