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I’d say - ability to use it across platform or across system accounts. I like to use my personal LastPass when logged into my work laptop with corp account. Mind you, not to store work passwords, no, to have access to e.g. my Amazon account.

Additionally, I share my LastPass with my partner. Probably not a setup for most, but we find it convenient.

All that is achievable only when the password manager is not tied to the system login.