The spec is designed to help; not to hurt. i’m absolutely sure the spec developers don’t intend for you to create an absolute train wreck of an onboarding experience for countless users. The spec recognizes there’s a bit of complexity here which should be carefully considered, which may be why they are intentionally vague. No one is stopping you from implementing a solution except your own lack of will.
We’re attempting to migrate thousands of customers to a rewrite of our application, but since we can’t send them to a SIGN UP form, many users try to login to the new system with their old credentials. We trusted Auth0 but it was a mistake. Our migration has been nightmare for our users, engineers, and customer support team because you refuse to make this fundamental and necessary feature a priority.