I've got another post brewing, but there's one thing I want to say that doesn't quite fit into it, so I'm making a quick note of it now:
Why, internet? Why did you have to hate on Revamp Strawberry's puffy hat? That's why none of the other girls have big hats, opting instead for headbands and barrettes, and that's why next to none of Strawberry's dolls come with the hat. And I love that puffy hat! It was one of the first things I loved about the new style. That, and that she had green-striped tights again.
So yeah, I'm pretty sure that it was all the backlash against the new style that axed big hats for the rest of the girls, although it could also be that designing big, puffy hats is not the easiest thing in the world, either.