Some countries have organisations that supposedly dictate the use of some official language, the French being a notable example, but whether anybody listens to them is a whole other story and frankly I think that’s probably for the best. Languages have always been influenced organically by the cultural forces at play, they serve and reflect the speakers not the other way around. They need to adapt to the experiences and lives of people that are using them and no steering committee is going to be able comprehend nor account for the totality of that. Maybe they’re useful for like helping a publication produce a style guide since they can defer to something “official” but that’s about it.