But pick a technology used to write code and you’ll see many of the same things. Broad unit test adoption happened more then 20 years ago and people still can’t decide what it’s good for or even if it is useful.

That’s because it depends on the circumstances of the problem and the person solving it.

So no, we can’t decide exactly what it’s good for and if we could there would be exceptions. But that’s not an indictment of any tool.

AI is a diverse technology and will work differently for everyone, just like JS is a really, really bad technology for many, yet widely used.

On top of that it (as coding agent) is brand new, just a few years old. Looking at the history of technology it will probably take a few decades for it to settle into some sort of stability. Which does not mean it does not provide value during this time of exploration, however there is no trodden path leading you there.