Same with billions of programming languages, frameworks.
Do you guys complain because there is more than 1 game studio? You'd rather have one movie/serie and a handful of actors director so all movies and series are made by the same team in order to not waste ressources? A single house architecture plan so that everyone live in the very same house with no customisation possible?
Do you guys complain because there is more than 1 game studio? You'd rather have one movie/serie and a handful of actors director so all movies and series are made by the same team in order to not waste ressources? A single house architecture plan so that everyone live in the very same house with no customisation possible?