As told by the show's showrunner, they lost their creativity. Well, all the creativity for characters who's fandom is growing. Even with everything they wrote to make April Kepner less appealing to fans, she gained a lot of support. partly because of the actor who portrays her who is one of the biggest fan of the show but also because of how unfairly she was treated. A lot of fans expected season 14 to be the rise of Japril but with the change of showrunner, it would not happen. Krista Vernoff publicly stated her disaprouval of Jackson and April as a couple and made sure that when she would come back, it would be felt. In the first episode of the season, they vaguely talked about what had happened between them in the 16th episode of the 13th season and then, only talked to each other severals episode later despite sharing an infant daughter. Vernoff clearly made them disappear for her own satisfaction and not for the fans demand. If we had only watched season 14, who could've tell that Japril had even once been an item or even knew each other personally?