instances are like countries with their own constitution (rules) and police (mods). This means that two communities in different instances may seem the same, but they are not, because they have to follow the rules and culture of their instance.
Just like a Technology club in Japan will not be the same as the Technology club in the US because they will be culturally different. I think it will take some time for the Fediverse to think this way.
For me, this is better. Instead of having one giant technology community where your comments and posts are drowned out, we can have different technology communities with their own culture and norms, just like we visit different countries. Your comment and posts will be not drowned out.
It is a different paradigm to the centralised one of Reddit.
This is not an anti-American comment, but a fact. The USA is a superpower and a big country. As a superpower, americans don't need to be informed about what happens in the world because it doesn't affect them. Their country is the source of world power. And Americans tend to travel within their country because it's big and full of tourist attractions.
Compare that with Canada, which has 40 million people. We need to be aware of every single decision the US makes so that the country can adapt. There is a famous quote from Canadian Prime Minister Trudeau: "Living next to you is in some ways like sleeping with an elephant. No matter how friendly and even-tempered is the beast, if I can call it that, one is affected by every twitch and grunt."