Been playing PvP in MMOs/MOBAs for years, and this was one of the most infuriating experiences that I ever had. As a healer (not AST), you only have fun if your Equanimity/Surecast/Swiftcast is up, once it's on CD, your fun is over, your skill is over, your counterplay is over. It's basically just:

stun, stun, interrupt, stun, stun... holmgang, interrupt, stun, stun, stun, int...

Yes, I can survive with sprint and instant heals + kite/LoS, but this is not fun, it's fucking ridiculous. I tried to like it, bought some vit acessories, read guides, expent an hour organizing my hotbars with all PvP skills just to be extremely disappointed. Pretty sure this mode will die aswell, sadly. PvP in FF is poorly designed.