Keeping this first release to a strict MVP was one of the challenges. As we were still looking for our true market fit, there were a lot of ideas floating around the team.
I worked with the development team to come up with all flows for existing and new customers.
The signed in experience tested well and matched the mental model of existing members. Some of them thought we already had this and others thought it was really odd that we didn't. We are continuing to grow the product based on this foundational experience.