I disagree. It’s not good to mix genes that didn’t evolve to work together. It breaks down coadapted gene complexes. In fact, the negative effects actually get worse with successive generations. That’s one of those things that experts don’t like to talk about because it’s “racist”. But studies show mixed people have much higher rates of genetic disease; physical diseases but especially mental illness. Which is what one would expect since genetic studies show the human brain has undergone the most evolution over the last 10,000 years.