Yes, the key is the lacking capability of the mobile apps, iOS in my case, not the web vault, desktop apps, or browser extensions. In those three cases, you can search globally and notes are included (or can be). I have found for some reason that email addresses are not found by default if they appear within notes, or at least some don’t. However, that can be overcome by searching using >email_address*.
However, because the mobile apps only use a Basic search, the contents of notes are NOT searched, which is what is desired in this thread.