In Board 12, on the Relationships screen in the data model, if an entity member was not assigned on the relationship, there was a bright red warning at the top to alert developers. This was GREAT. Broken/unassigned relationships can cause all sorts of issues with dataflows. In Board 14, this is gone and there is no way to know if an entity member is unassigned except by scrolling through the entire entity list. I submitted a ticket for this "bug" and was told this was intentional. Please upvote this feedback. I don't have any idea why Board would want to eliminate helpful warnings such as this.