You can't say that a Tesla car represents technology innovation to the same degree the iPhone did. Nothing in a Tesla is technologically groundbreaking, it is more of a product innovation (a high-powered electric car) with good execution.
Which is exactly what the iPhone was. Not the first smart phone. Not the first touch screen device. Just an innovation (iteration) with good execution and strong branding driven by a man with a strong vision for his product.
I don't know that Tesla is a good stock to own right now; I don't know if they'll be as wildly successful in the long run. But you can't just outright dismiss the previous poster's comparisons to the iPhone.