I think the important thing is that considering a project useless frees one of any obligation to think about its usefulness. It might not be useless but its val

I think the important thing is that considering a project useless frees one of any obligation to think about its usefulness. It might not be useless but its value might come from not trying to be useful. Which is probably what you meant anyway, but I think "useless" means two different things here.