Ok, sorry, rephrase: a useful aligned AI.

Expert systems are plenty useful. For example, content moderation: an expert system can interpret and handle the common cases, leaving only the tricky cases for humans to deal with. (It takes a bit of thought to come up with the rules, but after the dozenth handling of the same issue, you've probably got a decent understanding of what it is that is the same – perhaps good enough to teach to the computer.)

Expert systems let you "do things that don't scale", at scale, without any loss of accuracy, and that is simply magical. They don't have initiative, and can't make their own decisions, but is it ever useful for a computer to make decisions? They cannot be held accountable, so I think we shouldn't be letting them, even before considering questions of competence.