I have now tested to create several accounts with all my nativ Nextcloud and Owncloud installations. With none of them do I get a green dot when I create an account to access via WebDAV. From this point of view, it seems to me that this is a problem in the WebAPP. If, on the other hand, I establish a direct WebDAV connection to my data servers, it works perfectly.
Sorry, otherwise I think your thinking is not correct. The interest in a functioning overall package is available at the users. Now that the modules show themselves to be working after installation, there is even lively interest.
Moreover, I think that when a complete package is offered, not wanting to complete it just because there seems to be no interest is not a strategy. When I buy a car, an engine is still installed, even if I only push the car and don't want to use the engine .... 😉