The point is it shouldn't be impressive to people in tech, more par for the course if you work 20 years and save. I was responding to the question as written.
To your point though, if you do want to amass 1mm liquid quickly without a fancy certification (e.g. neurosurgeon), absolutely FAANG and wall st. are among the most risk free ways to do that.
Or you can go the route of pissing a lot of it away because you make "good money" now; your choice.
In contrast, I have the impression that some FAANG employees make it within 5 years or less, considering some of the salaries there...