Why isn’t there a separate gendered doubles rating and mixed doubles rating?

The UTR-P rating was specifically developed with sophistication around the data science needed to provide for an accurate genderless doubles rating. Meaning, you can rely on the UTR-P double ratings for gendered or mixed doubles. This way, finding a good mixed doubles partner is simple — just look for a person with a UTR-P rating around your level in doubles either male or female. The UTR-P Rating reflects how you individually play in a doubles match.