This is only about the master password. I assume it won't have any stupid requirements like "include at least one digit", and will instead assess the amount of entropy, allowing passphrases to be used.
Master password requirements are:
Strength meter at maximum.
At least 12 characters long.
At least 1 number.
At least 1 lowercase letter.
At least 1 uppercase letter.
At least 1 special character.
Not your email.