hmmm correct me if im wrong, it helps get power down. In that sense yes, if ur getting stuck alot, the lsd will help. but in theory, at the limit if your wheel's traction, actually you (with an lsd) will slide before a car without an lsd (car with an open dif will probably lose traction later since you dont break that traction threshold as easily. you dont tend to be able to put down power as suddenly with one wheel slipping away)
i could be wrong, but thats what i was told. Its not all pros, there are cons.