Doubt.
Innovation comes from people who are not content to put all of their energy into trying to be the most mediocre.
Most people want to be normal, and in a low tech society, the ones who view statistical averageness as some kind of virtue will be exposed to different creative norm-breakers depending on geographic location. This results in diversity among normie cliques - while they're each competing to see who can be the most mid, their definitions of mid will be different.
Even if the kind of humans that have the desire to be seen as normal were to all form a singular herd, the source of their previous diversity will remain. People who don't actively mold themselves to become statistically average will still be here, setting trends, attracting followers and haters.
Its likely that OP's author doesn't see things that way because they're in the camp that views conformity and the mediocre as virtuous.