The issue is the same as always, once something goes massive, the statistics of human nature start to dominate. The abundant dissemination of information tends

The issue is the same as always, once something goes massive, the statistics of human nature start to dominate. The abundant dissemination of information tends to average society. Note that local cultural differences have been slowly being erased. You travel now, and it's not as alien as it was 30 years ago, even languages are borrowing more from each other (why does Europe has so many languages? It was hard to talk to people a couple valleys away, not anymore). So, given that human intelligence seems to be normally distributed (we can argue about the measurements, but they all distribute normally), this averaging process takes us all toward mediocrity. Even taking algorithmic feedback into account, those also are trying to maximize engagement, and ultimately, that's also an average.