The DB5, as packed with fun stuff as it was, was the worst designed of the cars. The Mustang is so far the best in terms of adherence to reality, followed by the Mini Cooper and the Beetle. I'm not sure where to place the VW or the Caterham. They were both beautiful designs but I feel they missed something with the curves of the front of the camper that could have made so much prettier. I still have the F40 in its box. I never assembled it.
The Fiat is like the Mustang, Beetle, and Camper...it actually revolves around a theme. With the Mustang it was the thrill of the race, the Camper with hippie culture, the Beetle with surfers. The Fiat is just what the instruction booklet says, it's themed around La Dolce Vita attitude of the 50s and 60s, and that's captured in both the choice of car and the choice of color for it. When they added the art materials with it, it became a symbol of the roaming artist making a living by traveling the world. Like the others, it gave it a dimension that related to certain people's backgrounds or past interests, but with the Fiat it actually linked it to a person, which may resonate with more people. This way, it becomes more than just about the build, which is where I sincerely believe LEGO succeeded.
There are only so many ways you can manipulate bricks to recreate a curvy car, so the design, while not accurate, is as close as it can come.
For those of you who've lived on either side of the pond I'm sure you understand the choice of themes that LEGO is trying to capture. It's why I'm praying they come up with a Citroen 2CV that's close to some of the ones that were rejected on Ideas. That, again, is an iconic car that changed the concept of mobility for many people and became a cultural symbol. If you go with that fourth dimension of linking the design and build to a persona, think of it on a farm in the French countryside, and imagine if they put in a little inside joke in honor of the original design brief and added a build of a basket of eggs.
I don't know about you, but have a feeling it's gonna be coming somewhere down the line. Thematics seem to be getting more important with LEGO's latest builds, and since they're playing on the nostalgia factor, I think we should expect them to come along with the designs from now on.