DPS why don't you know your rotations?

[Leowilde]

The first times in a duty, even if guides have been read, I prioritize extra attention to aoes, markers over head and adds before 100% rotation. If there's a lot to pay attention to. Shiva EX comes to mind. A dead dps won't do any damage at all.

Edit: also, of all the thousands of people playing this game, you can't honestly expect all of them to know everything, however obvious it may seem to you and your experienced self. I remember my first time playing an mmo. (Dabbled with wow back then). I enjoyed the vast landscapes and knowing the other characters were real people. It was mindblowing back then. But I was overwhelmed by the amount of abilities, and I had absolutely no idea there even existed designated roles in parties. Someone snarled "let the tank do the tanking", and I genuinely had no idea what that meant, or why they were angry. Sure, I've learned my way around this since then, but I still remember when I was new.