Good gravy.
Just reading through the extensive changes, Frontline is going to be a very different beast.
There are some definite positives here. Tanks/melee look like the big winners with the reduction between action execution and effect activation. But if it works, I think everyone will be pleased with that since it should feel much crisper.
Some of the role actions are... surprising. I can't quite imagine what a 30-yalm knockback (Full Swing) is going to look like. Isn't that about twice the diameter of Onsal mid?
Healers have more choice as to whether they're going to heal (either spot or shield), or emphasize their role as green dps.
Overall I think this will take AST out of S+ tier, which will give me the nudge I need to try some other jobs.
And irrespective of the specific changes, everyone basically gets one extra button which can only be good. Particularly if it produces AFK puree of the non-combatants.