I also played Aion, so I know the Combos, and I think It would really spice this game up.
I really like this whole Idea of "Combos" and "Finishing Moves" It reminds me a lot of the Tales of Series where you can link Artes to make Combos and Mystic Artes or Combination Moves using the Over-limit bar as your Trump Card.

I personally think It would also be really cool If there was something like Over-limit bar in XIV, but I know I'm hoping too much :P

EDIT: I wonder what's happening with Battle Regimen now, and how it will turn out 0.0 maybe like XI Skillchain? Bonus effect when Chaining certain Combos with each other?