4th job Single Target DPS

Not quite sure what you mean by not using at all, the buff it gives and the duration is lower than in pre BB. However, is it a must learn skill and I still use it to this day. Unless you mean fatal blow, then yes nobody really uses that anymore. Because macros are limited, at most you can throw in 1 upper stab in between chains of hell when the dark sight fails to keep its form. There's actually room for 2 upper stabs but, its tough to keep track of during bossing and requires quite a bit of concentration and button tapping.

He means he didn't include Final Cut in their damage calculations.