Even if degoogled, Chromium still does a poor job at protecting your privacy.

Why would you want to delete all vaults anyway

If they had an office suite available there wouldn’t be a need for another OS/Linux distribution imho. Polish the existing products and any Linux distribution should do the trick for you, most of them already are very privacy and security focused.

I personally use both a local password manager (KeepassXC) and a cloud based manager. The “critical credentials” as well as 2fa recovery codes and such go into the local vault. Critical passwords are for example the ones for mail providers, encryption keys for backups etc. which allow me to recover my accounts in an emergency. The rest goes into the cloud manager for convenience.