v14: Why is VersionedDeliveryApiRouteAttribute internal (and sealed)?

[LennardF1989]

While VersionedApiBackOfficeRouteAttribute is not.

This doesn't seem intentional, rather something done by default, but it makes adding new endpoints to the Delivery API annoying.

Something that could be this:

[VersionedDeliveryApiRouteAttribute("lennard/delivery")]

Now needs to be this:

[Route($"[{Constants.Web.AttributeRouting.BackOfficeToken}]/delivery/api/v{{version:apiVersion}}/lennard/delivery")]

Initially my thought was: maybe Umbraco doesn't want us to add new endpoints to their OpenAPI document. But that raises the follow-up question: then why is it allowed on the Management API?

From an automated client generation perspective, I guess it makes sense in some scenario's to put all custom endpoints into the same document as the Umbraco one.

Just tagging some people that might know why: @nul800sebastiaan, @bergmania