It seems a shame to me that technology like this is not available to all amputees. I can only imagine the frustration I'd feel if I lost an arm or a leg and couldn't afford this, and had to settle for a "dumb" prosthesis instead. And I can only imagine this problem getting worse in the future, because this type of thing will never be able to reach the economies of scale to make it available to "ordinary" people on their own.
In my own country, to my knowledge, this isn't yet an issue, but as technology progresses and with budgets getting tighter it wouldn't surprise me if it becomes one in future.
I actually saw someone using a motorised prosthesis for the first time recently, and it was very impressive to watch. I'm optimistic for the future, I just hope everyone who needs such technology can get access to it.
The mass produced prostethic limbs with control systems are mostly mechanical and slow, e.g. the users are using the remaning stump of their limb to push buttons on the inside of the casing.
To use neural networks or some other kind of machine learning to map the muscle signals to the wanted movement for the prosthesis would be a really interesting problem to work on.