Since this sounds like a subjective take on how media is changing, here is how some people describe this "maturation" in modern entertainment:
It is frequently used in essays discussing how popular media shapes or reflects the maturity levels of its audience. Community Perspectives foxxx matures
It might describe a shift in a franchise (like a gritty reboot of a cartoon) where the "entertainment content" is being aged up or "matured" for a legacy fanbase. Since this sounds like a subjective take on