There's something much worse than "I'm not a lawyer" and that is "I'm not YOUR lawyer" -- you can practically assume that if you are reading a document produced by a lawyer you're not paying for, it is because it's trying to influence/scare you to act against your best interests (and into the lawyer's employers'). And FUD is a technique which is well defined in the handbook.
I've read plenty of documents from lawyers I don't pay that were not trying to influence or scare me. It would be really strange to assume their documents were. And when it comes to interpreting legal documents (what is being discussed here), "I'm not a lawyer" is far worse than "I'm not your lawyer".
