As a security-minded IT professional, I'm finding myself confused that very similar passwords are considered "Weak" or "Strong". If I generate a 14-character random password with lowercase, uppercase, numbers and symbols, Proton marks about half of them "Weak" and half "Strong". Similarly, all randomly generated 16-character lowercase passwords are marked "Vulnerable", while increasing that to 17 chars results in all being marked "Strong". There seems to be some strange inconsistencies with the grading algorithm (see another user's request titled "Improve the Accuracy for the Weak Password Detection").

Regardless of user knowledge and experience level, and accepting for now the separate issue of inconsistencies with Proton Pass' password strength evaluation, a middle-ground classification for acceptable password strength would be more clear and and intuitive for users when considering their password hygiene and determining their own priorities.