It is valid to say they do not have the majority of trade-secrets in the schematics. However having high quality documentation that is easily accessible is alw

It is valid to say they do not have the majority of trade-secrets in the schematics. However having high quality documentation that is easily accessible is always the first step, and if there are information there that are important it is _much_ more likely it will be known. It is not "a much less of a deal" as you say, it is a pretty big deal for a global product that billions of people touch.