I am starting to do one armed snatches because of a back problem that I have. Actually, I'm not even working with the other arm. The erectors in my back are uneven and disportioned. My left side is much larger than the right (since I am right handed). So I do the snatches with my left arm to try and even out the right side of my lower back.
I have to do these since if I do DL or better yet Romanian DL or anything of the sorts, the stronger side tries to compensate for the weaker side equaling in a lot of pain. One side of my back is screaming and the other wonders if we're in Margaritaville.
Also one arm DLs too. Still do regular DLs, but work those in additionally.