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It just makes in infinitely more difficult to near impossible for non electrical engineers to finger out the schematics posted in forums or such, when the manufacturer proprietorially closes off all public access to specs for the model, ie: honda - as one example. Well maybe not infinitely impossible, but damned near close to it for anyone without prior knowledge and or enough experience to decode what the schematics are showing as well as the experience to comprehend the ramifications of the implementations of individual who figured out the original fix - descriptions and examples. Just a couple of variables to sus out individually.
On something as easy as body codes, most anyone can sus the important parts fairly easily - relatively speaking.

I'm by no stretch of imagination implying the automatic extended door handles was easy to sus out or for others to follow. What I am trying to say is that the stuff gets mighty complex for generalizations about what the status quo is on any one project for any one manufacturer is just fodder for argument at best.