Queen Máxima of the Netherlands seems to do ok with a ginormous personality and dressing to go with it. Less stuffy RF though.I do like Kate, I appreciate her fashion and the fact that she herself doesn't seem to enjoy causing drama. It's quite rare to see in someone who has a public profile.
I also think that the criticism that she's bland and all that would be better aimed at the BRF itself. The institution as such dislikes big personalities. It's not about individuals, except the Queen of course, and now to a lesser extent KC. Kate isn't supposed to steal the show, not with her opinions or her charities or anything. It's sad if you think about it. She went to good schools, has led an interesting life. I'm sure she has opinions but she can't give them freely.
She also seems smart, imo. She knows what happened to Diana of course, she's seen what happened with the Sussexes. She knows that's not what William wants or what she wants if the goal is becoming queen one day so she just stays in her little corner and is as harmless as possible.
They do need better advisers for their charity portfolio but really, how much say does she have?
It's well known that both Charles and Philip paint/ed. I think they both exhibited too. It would be interesting to see Kate's paintings and photographs, see differences and similarities etc.