This is really the point. The $40K+ prosthetic is simply over engineered. It's a poor argument saying that we should support engineers, their families, their companies, etc so that they can charge a disabled person $40K when we could have a single developer make a much simpler product that can be produced at a local 3D fab shop or in the garage of an enterprising neighbor.
Clearly this is an early version, though fully functional. Improving aesthetics can certainly be an optional component. Today, a black or clear acrylic prosthetic would be of very little concern to many people and I only see that as becoming more of a non-issue.
The other interesting part of this is that someone in need of such a device could invest in the tech to customize and produce a device specific to their needs. maybe they have a palm, or less to work with. Customizing the device to suit them at their own pace with rapid prototyping changes their disability. The thriving makers movement can facilitate the sharing of schematics so you might find a near-ready model that you can alter to fit. maybe even spawn a boutique prosthetic shop in your town.