The suits used to dive underwater were unbelievably impractical and ridiculous for centuries. Then, Cousteau developed the SCUBA system and suddenly diving underwater is practical, widespread, and completely portable.
Maybe this design is ridiculous, but in 10-15 years when every backpacker is powering lights, heaters, and communication devices with biomechanically powered gear, we'll look back and realize these are just the early adopters.
I read something about graphene smartphone screens powering the phone with the heat generated from your fingertips the other week…