Useful is, the 'star-splitter' approach. Useful for what? Many things. Many- many things. For its use is so grand in-scale so large in-capacity so rotund in-enormity... it'll be easier to ask "What can't its use for?"
But I'd never tell anybody that. You're asking me like I've got an answer. Let's not make a liar out of whomever-- whoever is put on the spot w/ question asked a lot like that? Difficult to deflect...
Did you know that- by design -purpose remains unresolving? I don't know; I've heard it somewhere. But its implying Life's purpose. And it's not referring to God.