One way to create and exploit a domain of expertise, is to make it complicated. Complexity has to be assimilated and that takes time and resources. Special terms have to be understood, special modes of expression learned, even special forms of behaviour. Barriers to entry economists like to call them.
It all serves as one more way to keep out the riff-raff, create business for those inside the domain and foster ignorance outside it. No wonder complexity is so popular.