Selecting Captivate Prime ID as login method, still forces self registrants to create Adobe ID

In the July 2016 update I see the provision for using either Adobe ID or Captivate Prime ID as login method. When you select Captivate Prime ID as login method and set up an external, selfregistrant user group and use the provided link, it brings the user to an Adobe ID login. 

How do I avoid forcing my learners to setup Adobe IDs? It seems really self-serving of Adobe to require their customers to force feed their learners into the Adobe marketing machine.

Precisely what is the difference between Adobe ID and Captivate Prime ID and how do you implement a NON-Adobe ID login procedure? Adobe Connect Pro doesn't have this issue, so you'd think it is possible?