Limit Break for Tank, is it useful? when and where can I use it? Should SE change it?

[Liger]

No ingame mechanic is supposed to save you from boss insta-wipe attacks (like titan if u miss the heart) .

Sure thing!
I mentioned titan as an example where I would want to use a tank LB. It is not why or why not it is not blocking "isnta-wipe"
But what I mean if you compare LB3 for WHW, BLM and melee classes, Tank LB is nothing. was wondering if anyone is using Tank LB?