Imperfect password manager better than none
troyhunt.com
troyhunt.com
Because computers are today so cheap. It's possible to run totally separated systems for different projects, to guarantee proper isolation. I've been doing that for a long time. Because security is so hard, virtually impossible.
It's also a major catastrophe if you happen to lose the password managers password. Most of sites you'll probably never recover and for key sites, it'll take a really long time to gain access again.