Royal biographers say Kate Middleton's evolution from a middle-class St Andrews student to a central figure in the monarchy was the result of a deliberate, patient strategy rather than chance. Author Simon Vigar, writing in "The Four Wives of Windsor", quotes a source close to Prince William describing Kate's approach as one of "steady progress", while biographer Christopher Andersen argues she possessed an innate calm and confidence that made her well suited to royal life from early on. The experts suggest this careful positioning has made her an increasingly trusted and influential figure alongside William.

Vigar highlights how Kate unified several of the couple's charitable interests, including support for wounded service personnel, early years education and homelessness, under a single mental wellbeing initiative, something he says was her own idea rather than William's or Prince Harry's. He also notes the significant social distance she travelled compared with previous royal consorts, being from a middle-class background unlike the aristocratic Diana or the "posh" Camilla. William and Kate married in 2011 after a ten-year courtship that critics once mocked, but which experts say gave her valuable time to learn royal life from the outside before formally joining the family.