Is serenity worth it for raids now?

With the global cooldown change to all attacks, it makes me wonder. Pals don’t activate their attacks as soon as possible. There seems to be a pattern, they use all 3 attacks then use that filler attack once, then go thu the 3 moves again. I feel like another passive like diamond body would be way better now instead of Serenity for raids.
What do you guys think?