The adjective 'useful' is doing a lot of the heavy-lifting here.
What kind of 'useful'? Normative? Empirical? Prescriptive? Pragmatic?
'Useful' is a very subjective north star.
>What kind of 'useful'?
Someone says it's useful to them. If you get a consensus where >50% find it useful, then it's probably useful.
>What kind of 'useful'?
Someone says it's useful to them. If you get a consensus where >50% find it useful, then it's probably useful.