In simple terms their introduction has killed true democracy, reduced merit-based appointments and introduced the insidious practice of identity politics.
The latter relates to backgrounds such as age, religion, social class or caste, culture, dialect, disability, education, ethnicity, language, nationality, sex, gender identity, generation, occupation, profession, race, political party affiliation, sexual orientation, settlement, urban and rural habitation, and veteran status.
You don’t need an independent board to cater for all as a geographical representative is perfectly capable of looking after the broad church.