I think it's very misleading to call this "confidential mode for email". It's just putting the message on a webpage and sending the person a link to authorize access to the page, right? (And maybe messing with the gmail interface to hide that this is happening.) It's a really different concept altogether than email. If I understand right, it's basically like creating a google doc and sharing it with only certain recipients (and ability to revoke later).
I think it's very misleading to call this "confidential mode for email". It's just putting the message on a webpage and sending the person a link to authorize access to the page, right? (And maybe messing with the gmail interface to hide that this is happening.) It's a really different concept altogether than email. If I understand right, it's basically like creating a google doc and sharing it with only certain recipients (and ability to revoke later).