I always assumed that the option only determined whether or not they were given the ability to click and view the password in the LastPass UI. The password must

I always assumed that the option only determined whether or not they were given the ability to click and view the password in the LastPass UI. The password must necessarily exist on their computer in an unencrypted state in order to fill out a login screen. It seems really strange to me that people would assume there was a way for it to be securely hidden from the user. Either way, sharing the password assumes that you are giving them the ability to login to your account. If the person you share with wants to give the password to someone else, it doesn't matter if they can see it or not. They can just share the password to their LastPass account. In other words the fact that they can see the password doesn't change anything from a security standpoint. I suppose the one exception is a situation where you wanted to use the same password for your email and your bank and only wanted them to share access to your email but not let them see the password so they couldn't log in to your bank. This has a lot of security problems even if you aren't using LastPass or sharing your passwords. LastPass does warn you not to use the same password on multiple accounts unless you explicitly turn the warning off.