Reddit mentions of How Jews Became Germans: The History of Conversion and Assimilation in Berlin

Check out How Jews Became Germans, a study of assimilation in 18th century Germany.

TL;DR, wealthy, upper class Jews in quite a few Western European countries found it relatively easy to assimilate… as long as they agreed to (formally) convert.

Most of these people were completely secular, or nearly so, before converting, and typically they lived lives that were completely secular afterwards.

I suppose it depends on how you want to define hegemony.

You can always make divisions in society, even when culture is largely the same.

Take, for example, the protestant reformation, where Christians decided to burn eachother at the stake (source:http://www.tyndale.org/tsj06/daniell.html) or even smaller of a difference, the French revolution, where the educated upper middle class cut the heads off the aristocrats, or even smaller, the violence between loyalists and Patriots in the American Revolution, where base idealogical differences led British generals to instruct their men to take no prisoners, or patriots tarred and feathered loyalists and ran them out of the country (https://www.bostonglobe.com/arts/books/2017/05/18/dark-violence-and-atrocities-revolutionary-war/X4Kr4EzUUrNeVmnrNeSh2N/story.html)

In a more overused example, one could say that the push for increased hegemony was a major problem in 1930s and 40s Germany, where, despite attempts at integration by the Jewish people, they were still persecuted (https://www.amazon.com/How-Jews-Became-Germans-Assimilation/dp/0300151640 is my suggestion, but here is an overview on wikipedia: https://en.m.wikipedia.org/wiki/History_of_the_Jews_in_Germany)

So I would argue it is better to have a wide variety of people in society, to better allow an appreciation of the diversity of the human race, and also to allow a wider range of ideas and perspectives to help us along technologically. I would also argue for this from the standpoint of more people = stronger nation. I can expand on this if you want/if I have time.