I do think the blinking on combos actually made it less obvious when your combos were landing and continuing. However, I am not annoyed by blinking on the UI and find that a bit silly... I mean our HP bars have wavey cycling animations, this is FF, things are going to glow, blink, etc.

I don't mind the blinking on the reactionary skills but I think I had the reaction that it wasn't quite obvious enough, at least on a Paladin and Warrior since the color is a cooler blue and not extremely noticeable.

Just my 2 cents; I really appreciate reactionary skills lighting up now as that was a much needed addition to the game.