Yes, one car did Mach 1. And the first production car, the Benz Velo, could only go 12mph. It's an apt analogy.

As I mentioned to OP, applying future aspirations to the current space is incorrect. Some people are able to understand the progression of industrial automation, some people aren't. But if you look at the current batch of frontier models and say, "I just don't see how this is going to be useful", then you're in the camp of those in the 80's who didn't understand personal computers, or in the 90's who didn't understand the web. In hindsight, the technologies evolved massively and found routine use cases that no one initially predicted.

I think my main contention about the analogy is that Mach 1 cars are sort of a ridiculous target, a thing that only happened once just as an attempt to break a barrier, more like a tech demo. Billion dollar startups are very rare of course, but they are real things that happen for practical reasons as part of the industry.

Saying that the person you replied to was looking for the former when they really wanted the latter seems uncharitable. Especially given that replacing most of the engineering department doesn’t seem to be too outside the scope of what some in the space are promising(?).