I don’t know much about the Royal family and dukes and earls and all.of that. However, nowadays aren’t they mere figureheads, with no real authority?
Isn’t a title such as Duchess of Sussex something akin to being a Kentucky Colonel?
The House of Lords still has some hereditary seats, which actually play a role in governance, but apart from that, the titles are generally property to be passed along as part of an inheritance.