In general, most of the concern on this site regarding unfriendly AI involves the problems associated with autonomous AI and self-improving AI.
You’re right that an AI that cannot do anything unauthorized on its own, and cannot improve itself beyond its initial architecture, is not particularly dangerous. (It can of course be enormously dangerous in short-term practical terms, like many other new technologies, but it does not pose a significant existential risk.)
In general, most of the concern on this site regarding unfriendly AI involves the problems associated with autonomous AI and self-improving AI.
You’re right that an AI that cannot do anything unauthorized on its own, and cannot improve itself beyond its initial architecture, is not particularly dangerous. (It can of course be enormously dangerous in short-term practical terms, like many other new technologies, but it does not pose a significant existential risk.)