One problem with that model is that if the product ends up being unsafe and someone dies, it becomes the regulator's fault that they failed to prevent an unsafe product from being marketed and sold in the first place. Heads will roll.
We as a democratic society decided awhile ago that the benefit of knowing a car product was probably safe outweighs the frictional burden of testing them before they can be sold.
There's a lot of insinuation here that the regulator is actively trying to kill his product, but no evidence. This seems like a run-of-the-mill request, one that the NHTSA probably sends out thousands of times a year to various automakers and auto parts suppliers.
As a counterpoint, I'm sure Tesla has gotten these letters as well, but the NHTSA didn't prevent them from putting AutoPilot on the market.
> what is the repercussions of what you send to NHTSA? Say he sends something inaccurate or glosses over details.
The letter specifically says that estimates are ok. There's nothing wrong with telling the regulator 'We're not sure yet, give us a month to figure it out please?'.