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.

Ok, that's empirically useful by argument of popularity.

By that same measure: correctness, maintainability, and efficiency are not that useful.

I wasn't saying usefulness is not important, I'm saying this post conveniently crammed the hardest problem of writing software into a fuzzy adjective.