[gmisra]

Does anybody know what happens when an add-on augmented e-mail is opened outside of Gmail (or, presumably, Inbox)?

There is a huge difference between:

Google is enhancing e-mail in a way that makes e-mail better for everybody.

and

Google is migrating GMail to be another walled garden collaborative workflow tool that happens to have a very good e-mail client build in.

[ucaetano]

If you look at the examples, they all look like adding extra functionality to your inbox, not to the content of the emails you send.

So it doesn't sound like "I'll send you this email that you can only access if you have gmail AND this specific add-ons", more like "when you open an email, the add-on shows relevant information from your internal CRM system as well as canned responses".