The thing is you don't know that it's got actual future usefulness. You might think or hypothesize that it does, but for various reasons it may turn out to be a dead-end.
Almost every endeavour has non-zero potential future utility - even as a counterexample or lesson to learn from. I think that definition of "useful" is probably too broad to make an argument against, and so not a useful definition.
Almost every endeavour has non-zero potential future utility - even as a counterexample or lesson to learn from. I think that definition of "useful" is probably too broad to make an argument against, and so not a useful definition.