Correct.
The whole idea about the “invention” of the one-click was to make it easier for the users to install. Only once click on the “Install” button and it will then add the repo and do the installation in one “go”. AFAIK during that, it will ask if the repo should stay enabled after the installation But as the one-click is often used by people who have no idea about repos and what they are for, that question is not understood and skipped. 
The “one-click” also only functions from within a browser that is configured to understand the MIME type that is used for it. Other browsers will not understand and ask if you want to download the file, which then leads to further confusion.
As the most famous Dutch football-player once said: “Every advantage has it’s disadvantage.” lol!