The real problem behind 1P8

I do understand the concern about having to caveat advice, and I agree it is less than ideal to have to do so.

And, there's another issue. In an eDiscovery situation, there's a possibility that the employee may be compelled to give up their work passphrase...but now their personal vault is exposed.

How is this any different with the 1Password 8 model than with the 1Password 7 model? I would actually argue that with 1Password 8 people now explicitly have the option of not having the same password unlock both accounts, whereas that wasn't possible if you wanted to use both accounts with 1Password 7. With v7 one and only one password unlocked all accounts, regardless of what the passwords for those accounts were. With v8 if you don't want that to happen, and you want your personal data to unlock separately from your work data, you can.

Ben