"Content: ID" versus "Content: Nid"
Is Content: ID really the Drupal 8 equivalent of Content: Nid?


Yes


  Additionally, the Content:ID dialog has options not seen in the
  Content: Nid dialog, such as the options for Formatter, Thousand
  marker, and Display prefix and suffix.


Thousand marker makes sense. The other two not so much, bug maybe?


  In Drupal 7, many views are using Content: Nid (for the node ID),
  which doesn't exist in Drupal 8. I've read here and elsewhere it has
  been replaced by Content: ID, in Drupal 8.


I could see them thinking when developing the D8 version, who links to a Node/Entity using the ID? Using something descriptive like a Title, or "view/edit/delete" text makes a ton more sense, don't really need this feature for ID. Plus having to hover over single digits is not user friendly.

But, if you still want to link using the ID


Add the ID field and checkmark hide from display.


Then either add field:


Link to content OR Link to edit content

Under rewrite results:


Checkmark override the output of this field with custom text



Example: