Haven't played RPR, as i main mch, but in p2s i can always shuffle a bit in the dmg down phase at around min.4-5 - the ability with the numbers - forgot the name.
More annoying to me is P3S adds, as all my stuff gets ready while icannot attack the boss (worse, wildfire gets ready while you do adds, so you have to sit on it for 15-20 secs).
As much as this is a downside - i see one big upside - it adds another layer on top for me: trying to find the perfect rotation for the boss for my group, but yeah, i get your gripe with it.
My biggest hatred is reserved though for missing half a gcd and everything come of 1 second too early or too late - just feels so wrong!