Are you seriously saying that singing for 20% damage reduction is better than just popping one invigorate?

The thing is, lancers and pugilists also have invigorate...and they're also using it (they should be).

No group should ever need the TP song.

Furthermore, you should never waste a GCD on bloodletter.

The reason being that it is literally impossible for you to proc another bloodletter in the 1 second to move to the next inbetween gcd.

While if you use bloodletter in place of a gcd, you push your entire rotation back half a GCD.

Huge nono for dps.

Bloodletter procs have 0 bearing on your tp consumption.