The three "Atelier Liza" works were so "heterogeneous" that even the developers admitted them. Why did "voluptuous characters", "same protagonists", and "unique lighting" be introduced and what was the significance of their introduction?

The three "Atelier Liza" works were so "heterogeneous" that even the developers admitted them. Why did "voluptuous characters", "same protagonists", and "unique lighting" be introduced and what was the significance of their introduction?
We looked back on the "Secret" series and asked about the current and future "Atelier" series and the Gust brand....

The linked article is in Japanese.