Description
This is more of a suggestion/idea instead of an issue report, so I hope this is the right place to put this.
Since Automattic is working hard on their AMP for WordPress plugin, and Gutenberg is going to be stock WordPress come 5.0, I think it would be great if Underscores had an "Add AMP Native Support" and an "Add Gutenberg Support" to the advanced options dropdown when creating a new Underscores package.
The "Add AMP Native Support" option could generate an Underscores bundle with the appropriate add_theme_support( 'amp' ) code, as well as generate AMP HTML theme templates and support for an AMP compatible mobile navigation using the AMP Bind functionality instead of the JS version, etc.
The "Add Gutenberg Support" Will, of course, add the appropriate theme support for image sizes and maybe an example editor custom color pallet, along with a blank editor.css stylesheet enqueued and ready to go.
I think Underscores is one of the best starter themes out there since it is based off of WordPress Standards and maintained by Automattic. And since WordPress is wanting to champion Gutenberg and AMP for the future, having a simple starting point for people to start utilizing them would be a huge step forward. I think Underscores would be the best place to do that.