I would love to be able to take my car to a mechanic who offered, for a fee, to film the repair and give me a DVD afterward. They could use "helmet cams", like those used by adventure sportsmen. Then I could see what was done, what parts were used, etc. They could also explain why they were doing what they were doing as they did the repair. Making the DVD would be good for the mechanic too, because they could demonstrate that the repair was justified, and that they did it correctly.
Of course, it might increase their risk of lawsuit if they did it incorrectly. But hopefully, the number of lawsuits prevented would be greater than the number of lawsuits instigated.