We (Streak yc s11) were a launch partner on this and launched our Add-on today. Even though we already have a chrome extension for desktop, add-ons allowed us to live inside the native Gmail mobile apps. Happy to answer any questions about the add-on platform....
I’m unable to install the Streak gmail add-on in my GSuite org. The “install” button is just disabled. Is this due to a gradual rollout on Google’s part? I haven’t been able to find any settings in my admin section that would enable this. Also, are there any downsides or missing features of the add-on version compared to the extension version?
In terms of functionality, we're keeping our add-on fairly lightweight. On mobile, the add-on lets you deep link into our native apps for more enhanced functionality. On desktop, if you have our extension installed, it just replaces the add-on entirely so you get the most functionality possible.