This isn’t a problem with anime so much as it is with localization. Most of what makes it out of Japan is shonen, stuff aimed at boys aged about 12-18. There’s also shojo (same age group, but girls), seinen (adult men), josei (adult women), and kodomomuke (under 12s of both genders). Seinen in particular has an absurdly broad range of genres. For example, Ghost in the Shell is a foundational cyberpunk work, but Spice & Wolf is a slow burn romance about medieval barter economics.