I should have been more clear in my statment. When I said "Swipe boggles my mind", I mean it in the sense of they just said they want to make RUN more capable to tank. Unless this has heavy enmity strapped to it, all it will be is an extra JA proc and a way to add damage during Invincible. That's all it has going for it is being magical damage so far. I highly doubt SE made Swipe as potent as Lunge because they didn't mention Lunge in the update (though I hope talks about it have them reconsider it). Without even needing to test it, Swipe will just lower your damage over time because of the inherent delay of using any job ability and resuming auto attacking. Swipe > JA delay > Rune Enchantment > JA Delay. So it doesn't increase your damage over time and therefore will not increase your enmity unless it has some huge enmity amount tacked on to it.
Regarding Magic Bursting, setting up a skillchain is just not practical any more unless the enemy you're fighting needs skillchains to be made (which is barely anything) or you're doing a self-skillchain. As RUN/SAM, you'll be losing Provoke which is why I'm hoping this has enmity strapped to it. The only thing Swipe looks to do is give another source of elemental damage but that doesn't really help RUN with tanking or anything really. Is it cool to have another ability to swing and do elemental damage? Sure. Is it effective? Not really, not if it's just a mini-Lunge.