Having been to some ISO meetings recently, I can state without fear of being wrong, that ISO leaves itself wide open to corruption. There is a process, but it is nothing like a normal standards process with the usual mitigation to prevent domination by a single body and a convergent consensus process to get to an agreeable document in a reasonable time.
Participants don't even get access to the documents they are working on. They have to buy themselves copies in uneditable PDFs. The result is that people keep adding crap into specs that already exists in other specs, but no one knows to reference it. So these things become inconsistent over time.
You will find function specifications handled in one group and test & validation specifications for the same thing in a different group. So the function specification gets no consideration of testability requirements and the test & validation group don't get to specify that the thing be testable, only how it may be tested after it's been implemented to the spec that has no testability requirements in it.
ISO is not a competent organisation to write specs. Certainly not technical computer software and hardware specifications. Maybe they're OK at bridge loading specs, or non-stick coatings. I don't know.