Yeah, the usage situation for tank LB is the same as healer LB imho, but healer LB is far better cuz insta-raise. It's all a bit imba from the tank's perspective I suppose; so, the short answer to your question is "no, you'll never use it."

Maybe if you're in a light party with two bards and no one is on the verge of death. And even then, just maybe.