This is a thought, not sure yet:
If the hands are all the same manufacturing and systems inside, then the hands could share training datasets and talk to each other to better the movements.
In a human baby takes a good 10 years and millions of training trials to train the hands, and at that left hand in general is less functional.
If the hands have the same electromechanical controls and micro-controller is the machine learning based, then they should be able to share training data sets.
This IMHO should reduce the training of the hand to days or months than years.