Warrior Final Attack after Big Bang

I have yet to see anyone that claims final attack is useless. At most people only say that it isn't very helpful when it activates with slash blast due to the damage still being reduced every time it hits another monster in a mob.

It that even the case in Big Bang? I mean realistically it would do the same with all mobbing attacks: Ground Smash, Brandish, Brave Slash, Charged Blow, Rush, etc.