If you’re starting up a small business, selling at-a-loss widgets to gain market share do you want to be forced to publish a diagnostic manual that not only increases your work, but may also increase your liability?
Seatbelts and airbags are safety, but if you talk to anyone at a body shop, they will tell you there are significant regulation changes in the past decade that have made cars more expensive to fix while not necessarily safer.
I just don’t think it’s as cut and dry as everything must be forced to be documented. What is everything, at what size or industry is this documentation required, why this industry and not that one, is it just OBD or _everything_ including all CAN bus communication, etc. Minimally the end result is increased cost for everyone.
If it’s already published, perhaps libraries should start collecting the service manuals.