The evolution of Zoi is not very well optimized, lacking fluidity and realism:
The absence of birthdays prevents any natural transition to the next age (newborn, baby, child, teenager, etc.), which removes any real sense of the passage of time in their lives.
Family modification is too restrictive: you must exit the game and go through the main menu to change a Zoi, or use cheat codes that remain limited and do not allow for real modifications (age, identity, evolution).
To avoid these unnecessary back-and-forths, it would be much more immersive and logical to be able to create and modify directly in the game without leaving the session, in order to allow for natural evolution of Zoi.