This depends on what we're defining as documentation vs access. My interpretation of the start of the GP was more about passing over actual login/access information, which especially for assets and finances really shouldn't be handed over this way.

Documentation in the form of "I have a bank account at Bank X, and a will at Lawyer Y (or, I don't have a will, but there are established protocols to handle this)" (even if only verbally) is different than "here's my username and password to my trading account in case I snuff it".