That depends on the diversity. Whites and Orientals nearly always get along fine. Jews benefit Gentile cultures with their superior average intelligence.
Diversity of opinion is always beneficial. Unfortunately, the partisans of diversity, equity, and inclusion do what they can to suppress the ideas of Charles Murray, Jared Taylor, and Professor's Arthur Jensen, Richard Herrnstein, and J. Philippe Rushton. Most of the partisans of DEI know that most of the assertions of race realism are valid, and they fear what would happen politically if it became safe to express those assertions, and act on them.