"classes" of cars exist for the same reason "classes" of computing exists, e.g. servers, desktops, laptops, tablets, cell phones, etc. You can produce a more compelling product if you pick a very clear target, and you cover more of the market if you pick a variety of very different targets. This is super important for car companies, who can only afford to develop a few cars at a time.

As for boat-cars, I'm sure there's a few folks out there who would love one, but Tesla is seriously underwater. They need to penetrate the largest/most profitable markets and capitalize. Then they can worry about tiny niche offerings.

Isn't the point to promote electric cars as "normal" though? Anything too weird might put off potential adopters.

This is a good strategy IMO, getting rid of the engine is enough of a paradigm shift for now!

I don't know what their European sales look like right now, but I suspect making a land-yacht would limit their potential audience a bit. ;)

I was always under the impression that Europeans love land yachts. (like those kids in Sweden that collect old US cars) It was just the crazy fuel prices that stopped them from buying them.

My understanding is that large cars are difficult on many of their roads, particularly in some towns/cities.

good point. There are some crazy narrow streets. The bus drivers are insane. Like half of a foot of clearance between the wheels and the curb on each side.

I've seen 1/2 foot of clearance between the bus and passengers. (With a hedge and wall just on the other side of the passengers.)