Really informative little article. Reminds me of the shall/should and must/may that are in some processes listed in the CFR (code of federal regulations) in the US. Shall - meant you had to do it or be out of compliance (in some cases that was a felony). Should - was good practice but not a legal violation if you did not do it.
Interesting that you could feed that content into a prompt in ChatGPT and ask it to make those kind of evaluations.