I totally take the point about not throwing her into a bear pit of public engagements. But how long has she been living with William in Anglesey now? A few years? Hasn't she been doing her own thing all that time? They have both known marriage was on the cards for those few years - was that not time to 'explore fields that interest her'?
I don't know what extent William and Kate are financially and practically supported day-to-day by the state. I think it is fair for the state to provide and pay for their security and protection services, because those are required through circumstances that they didn't choose. But their house, belongings etc should come from their own earnings - i.e., at this point, whatever William earns in his RAF job. I think what is irking many people about this is the idea that we, as a nation, are somehow paying to keep Kate in comfort while she does little or nothing to earn it. An ordinary housewife can choose that route, sure, but has to be able to manage on her partner's earnings. As it is, there is something of a double standard in that if she was an ordinary 29-year-old childless woman, living on benefits but capable of working, public opinion would be that she ought to do something useful and/or that earned her keep.
I'm genuinely quite surprised at myself to be saying this, as I have been pro-royal in the run up to the RW on here, and I enjoyed watching the wedding. But I do think that while not taking on public engagements is fair enough, the statement about not taking up any other activity has been badly judged. It sits oddly with the notion of W&K as a 'modern' royal couple too.