Problem: I would like to control the display of fields in wp-admin. I would like to display a single field only on one post type. I would like to display a single field conditionally based on user role. I would like to display an entire field group based on user role.
Solution: Individual field display in wp-admin can be based on other custom field values in the same post, but not User role. The best solution Toolset offers there is you can create a separate field group just for this individual field. Then you can manage that field group display by user role using Access.
Problem: I would like to display a Divi module conditionally based on some custom field value.
Solution: Divi's modules do not offer any conditional display integration with Toolset's custom fields. It might be possible to use shortcodes and Toolset's conditional HTML feature if the Divi modules you want to use offer a shortcode-based option instead of the builder option.