Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
Yes. You can create AMP pages that use the Layout canvas for content but there are a number of considerations.
No, the entity browser does not work for component defaults as the entities are content, not config.
HTML is escaped when using Drupal tokens in Site studio as a security measure, this follows Drupal core.
Yes, this is possible by creating a custom element.