If you’ve ever built anything you know that the only way anything gets built is with iteration. There are very few examples in history where something new got built and was a perfect finished product v1. The way we build new things is making something, testing it, measuring the outcome and then using the information to build v2.
Look at literally every product ever built, that’s how it was made. Rockets especially need this treatment, you have to blow up a lot of rockets to refine the process in any reasonable time frame.
It’s not just Elon’s methodology that’s all new things. How many iPhone prototypes do you think they created before they shipped the first one?
Neuralink is doing the same thing with lab animals, which by the way is an established practice used in all of science. The end result will be a cure for people who desperately need it and it will be within our lifetime if they are allowed to continue without regulatory roadblocks.