They don't rely on transferring the password via an insecure channel - your clipboard. Other applications can sniff the clipboard, you might accidentally copy

They don't rely on transferring the password via an insecure channel - your clipboard. Other applications can sniff the clipboard, you might accidentally copy another of your credentials into website or you might forget to clear it after use and then later accidentally paste it into an irc-channel. There is also risk of visually exposing the password in the text editor, either to someone else in the room, screen sharing or screenshot from another malicious app. A bit into the tinfoil-hat side, but it's passwords we are talking about after all.