I think the people who make shells and street dressing should be making more actual playable lots instead. I keep hearing players want more lots to build on, and that the worlds contain a lot of shells and set details that make them harder to customise. I mean I like the worlds, but also I want to change them more than I can.
For example there's a clocktower/station in evergreen harbour that would have been an awesome playable lot instead of a shell. And people could change it however they want if it was playable.
I also have mixed feelings about those little areas in worlds where there's things like childrens play parks. They don't always fit the area I'm creating, I wish they were like mini-lots and I could choose what goes there. Like a little park, or comunity garden, or whatever fits really.