Separate Password for Proton Pass
I don't use ProtonMail as my default mail service, therefore my Proton account is protected by a generated password that I can't and don't want to remember (using Bitwarden).
Having a way to use a completely different password than the one of my proton account to unlock Proton Pass will be a dealbreaker for me.

You can now set an extra password for Proton Pass in addition to your Proton account password, allowing for better compartmentalization and peace of mind. https://proton.me/support/pass-extra-password
This feature is rolling out today to all Lifetime plans, followed by a staged rollout for Unlimited plans, and it will be available to everyone else over the coming days.
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Y commented
Yep, would be great unlock our vaults with a password locally, so that even linked to our Proton account, we can use a proper password on ProtonPass.
I so agree with "ohoh" comment below. Too much concentration is not a good security way.
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Y commented
Like on Bitwarden, let the user choosing for password unlock (rather than PIN) on web and smartphone versions.
Like on Bitwarden, allowing to create a master password, uncorrelated to the our Proton account credentials.
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Paulo commented
Much like other services offer, using a master password to open the vault is a must, it's way more secure than using a pin
EDIT: Users are logged out after 3 failed attempts to protect against brute force attacks