The only reliable component about getting a job is being a desirable candidate. That's it. Maybe you write some great cover letters. I have worked for both startup and non-profit without writing a cover letter. Sometimes a resume and a glass of whiskey with the CEO is enough to get these jobs. I could probably get a job just as easily with a bottle of whiskey and two glasses as I could with a cover letter. Although the whiskey is the only one of the two I've any experience with.

Well of course being a desirable candidate is a prerequisite-- this thread is about cover letters as a means of conveying that. I've interviewed hundreds of candidates for dozens of positions-- from internships to regular staff developers to post-doc roles-- in an organization that drew ambitious candidates that shared our specific interests from around the globe. Our organization, at large, immediately rejected resumes with search-and-replace template or missing cover letters, by the hundreds, because people's hard skills and experience weren't the primary factors in determining whether or not they would thrive in this organization. As I've repeatedly acknowledged, there are many jobs, candidates, and job searching scenarios where that's not the case. Surely, the glass of whiskey scenario makes sense in many contexts, but in ours, it's wholly inapplicable. I'm not really sure why you insistently present your own use case for job application materials as an argument against what I said, but I've stopped caring and I'm done engaging you about it.

What a great segue back into my first comment in the thread.

> I never said you couldn't get a very prestigious job without a cover letter.

I didn't suggest this, at all. I suggested the value of a cover letter is not some constant across the tech sector, from startups (sample size = 2) to the big 5 (sample size = 2).