I've kept an eye on Sandstorm for a while now...however, I get the feeling that it is something I should want to use, but I can't find the use case that warrant

I've kept an eye on Sandstorm for a while now...however, I get the feeling that it is something I should want to use, but I can't find the use case that warrants it. Can any of the developers here provide a little more context as to when or where it might be useful? Is this kind of like a super simple Docker competitor?