I'm wondering how usable they actually are for normal people in stable countries. They have shown to work very well for darknet markets and things like that but

I'm wondering how usable they actually are for normal people in stable countries. They have shown to work very well for darknet markets and things like that but I wonder if there really is a use case for most people. I live in Sweden and I can buy something from the US in minutes over the Internet and the fees are pretty reasonable. Would a crypto currency have any advantage over the current situation?