It's painfully true. David Attenborough, if we're using him as an example, has a Master's degree from Cambridge. Just look at the use he's made of his education. And if you argue he has the advantage of longevity, which he certainly does, take Megan McCubbin. She's 15 years younger than Kate, has a zoology degree, and is an accomplished presenter and photographer (okay so nepotism helped her, but since when wasn't this the case with the Windsors and she's actually GOOD at what she does). She conveys a passion and dedication to wildlife and conservation, together with an ability to really interest and educate others about it, to which Kate's doddery FiL and his equally uninspiring son couldn't even hope to aspire.
Closeness to family and being well-travelled are things anyone can do. One thing to be well-travelled, quite another to learn about and respect other people's cultural heritage (cf. the Jamaica protests and toe-curling incident with the Land Rover).
Turning your hand to sports: well, that's a hobby. I'm a seasoned swimmer, and was a competition rider until I was injured in a showjumping accident this summer. It's not 'work', and it's extra-curricular as far as someone's career and professions are concerned.
Kate Windsor is a poster-child for women taking their entire identity from the man you happen to be hitched to, for looking pretty and for being seen and not heard. She's also notorious for being bone idle. If any daughter of mine viewed this throwback to the 1950s, if not before (ie. something out of Austen) as any form of role model, I'd be appalled.