Is -10% evasion the same as +10% accuracy, if so could we use that effectively?

[Kuwagami]

Does nin sacrifice his personal dps for the benefit of the group by using TA?

now that RoD is on a shared CD with bloodletter, bards do not sacrifice that much of their dps than they would have back in 2.X.

Though one shouldn't replace every bloodletter by RoD, but it can help to maintain it at least a bit during healers's dps phase.