I agree on CASIS. Again, this is an agreement that is now outdated. It's over a decade old, and information access must keep pace with the advancements in technology. Today we see automotive professionals who are dealing with vehicle systems and components that simply did not exist back in 2009 when CASIS was created.
Contrary to what you are hearing, CASIS does not work and it does not solve the problem, for a number of reasons.
First, it's not enforceable. There's no legally binding enforcement mechanism in place.
Second, as you mentioned, automakers are not required to participate, and some, like Tesla, do not.
Third, it applies to on-board diagnostic systems, or OBD. This is a technology that's becoming outdated. Again, an example is Tesla. Some Tesla models do not come equipped with standard OBD equipment. CASIS doesn't apply to vehicle telematics systems, which I spoke to earlier. This is a technology that's found in 60% of vehicles worldwide, and it will be in an estimated 95% by 2030.
Last, I would say that the agreement provides a framework for automakers to share repair information with the auto care industry on a level equivalent to that of their authorized dealers; however, some automakers have moved to a direct sales model, so that eliminates the traditional dealers altogether, along with their obligation to independent automotive shops.