" the entire claw is about as sensitive as the back of a human fingernail."
Fingers without tactile feedback are not handy
My primary reference for a question like this is my past involvement in robotics. Yes, a smart servo system using 4-5 axes of freedom and AI is perfectly suited for picking up boxes of any shape with metal grippers, as long as these boxes are solid objects. Issues start, when the object is not solid, or soft. To prevent damage, the metal pickers would be coated with softer material to prevent damage, and in modern versions, the servo is adjusted dynamically, using touch surface sensors. This kind of technology exists in medical robots, personal assistant robots, allowing these devices to help e.g. elderly people out of bed, or handle food, or glass objects.
Now suppose, nature has not solved above issues (you have a claw) and tool making starts 2.000.000 years before developing robots - it is easy to make an axe, but to throw it without a sling ? more difficult, you'll need sensory perception while making it, judging its shape, or even handling it. Apes and humans can throw objects very easily and accurately, because they have hands and fingers with tactile feedback.
Your clawed alien will have to do with eyes only. It will need good eyes, and it will need to look at a worked piece, at any time. This can be a serious handicap for any activities involving precision and soft objects. Everything from peeling a banana to, handling wood, eventually, holding a pen, for writing.. they'll need some more time to develop than apes !