Wait what? I grew up in Miami and ate mangos off the tree. I've also had store bought mango and Ataulfo (Champagne) mangos from Mexico. I don't think I'm missing anything with the store bought mangos. So I think that's a bad example.
But, there's a variety of pineapple you can only get only in Hawaii that's way better. And I've only ever sourced really good key limes from friends and family trees in Florida.
Store bought tomatoes are also usually shit, but you can get ones from the farmers markets and road-side stands.