Well, again, my comment wasn't intended as a criticism of Kate or Diana, just a comparison of how different their images are after their time in the public eye. For whatever reason, Diana's public life played out much more in public -- and she had an ever-changing style -- so she became more of a celebrity.
I can remember back in the 90s, there were times when magazines were reporting what Diana did every day, what she wore, what accessories she had, what products she used, and so on. We heard what time she got up, when she went to the gym, what music she had on her Walkman, what exercises she did, where she had lunch, what she ate, what friends she was talking to, what car she drove, etc.
Who knows what was true and what was made up, but that's the way the coverage was. She was covered like a movie star.
By comparison, Kate gets a lot of coverage, but most of it is when she's on official business. She gets plenty of coverage, and people do take an interest in her clothes, but I have no idea how she spends her days, and other than her sister, her friends aren't in the picture.
Just a different kind of coverage.