Nowadays, some big games take a long time to make. From inception to release, we might see a game go three, four, five and even six years before it reaches the public. In some cases, that game gets temporarily canceled or re-worked before fans ever see it.
Persona 5 was in development for a while, and that development length did take its toll on the creators.
Article source: https://www.technobuffalo.com/2017/05/08/persona-5-talks-long-dev-time-and-the-toll-it-takes/