Do I have to use IMCE?
No. Acquia Cohesion allows the site builder to select, either use of IMCE or Entity browser for browsing and selecting images.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
You can only add combinators to child selectors. Add a child selector and combinator will appear in the Style tree.
Yes, you can render react components.
Yes, the generated templates can be saved to the database.
Yes, this is possible by creating a custom element.
You don't. You apply a Descendant selector. These use a (Space).
If you want to add custom code to your website you can use Field formatters, Blocks and Custom Acquia Cohesion elements.
No site specific data is stored on the API.
Drupal content field data is NOT transmitted to the API. Only the underlying JSON schema and any information hard coded into templates and styles is transmitted.