I think culture used to be more united. There were significant limitations in the channels for producing and consuming culture. Used to be, to get people to read your writing, you had to go through either the effort of printing and distribution, or you had to submit to some editorial selection and review. Then the only channel people had to consume it was to get a physical print of it. Now anyone can write anything a…
To be fair, the monoculture was almost exclusively white, Western, Judeo-Christian approved media. It created a giant tidal wave of conformity on which progress rose, but it drowned out a lot of other voices. Always tradeoffs.
I agree that the centralization of culture allowed the people in power to suppress diversity and control the cultural narrative. But now there is no longer a cultural narrative at all. It is too fractures to make any holistic sense.