One other issue with these, as you can imagine, is battery life. We talked about paying out of pocket for the upgrade, but were told that the best batteries only last about 4 hours. You think your battery going dead and leaving you unable to make a phone call is bad?
Yes, it's unfortunate that not everyone can have one of these, but instead of lamenting the builders, you should be supporting them, because it's through the work of many builders working many hours that the technology progresses and becomes cheaper.
Not only does technological progress create better limbs, but it also drives down the limbs that were previously state of the art. A $50k prosthetic leg that a person desires today and that will make them happier might only cost $5k in 5 years because a far better leg (which may only affordable to the builders) is available meaning that manufacturers of the leg that previously cost $50k needs to drop their prices in order to maintain competitive.
Also, if battery life is such an issue, I would imagine that you carry around spare batteries. My garmin cycle computer only lasts about 4-5 hours if I'm lucky with all sensors on and my phone is usually dead at hour 8, so on 13.5 hour and longer rides I carry around a 12000mAh USB battery pack so I'm not left without GPS or the ability to contact people if necessary when way out in the middle of nowhere. If you know the limitations of technology you use, then you plan for it.
Yes, there are always better things out there and inconveniences, but things are getting better all the time. There is no need to be dismissive when someone like this guy is building truly amazing technology that is bettering the lives of 1000 people today and will probably better the lives of 100k people in a few years time.
That being said, I understand the frustration with trying to fight insurance companies for something that will better the life of someone you care about. Two years ago, I spent many many many hours fighting my mom's insurance company to get her a microsphere radio-embolism treatment for liver cancer that would have given her a much better quality of life than she has today and possibly alive for years to come. I wish insurance companies paid for more than they do, but it's also impossible for insurance companies to pay for everyone to have the best possible solution to their malady.