One benefit of a cover letter is it is easier to re-use the base story and update the details as appropriate. Unless you want to spend time editing (which depending on your skill impacts the quality) you have to re-record the whole thing.
The one time I recorded a video I had to redo it like 10 times and I eventually just submitted it because I was tired of the shit.
cover letters are terrible anyway. the signal to noise ratio there must be comical.
- ask for a very specific thing in the cover letter. In our case, which version of the specific IDE they were familiar with. - specify that we care about relevant skills, and having the legal right to work here. nothing else.
Of the 50-odd responses who survived a 10 seconds each filter (ie, did you answer the question), I skimmed the CVs and picked 10 I liked and 10 more I thought would be ok. I did this via a 5-bucket sort - as I read each email I dragged it into a numbered folder. Then I created folder 1a,1b and put 10 in each. Sure, that's about an hours work but it's easier than doing an online test and trying to make it non-gameable.
Interviews were a five minute chat then we dumped them in front of a computer with our development setup on it, and a series of programming tasks. Starting from "this button. Make it so when the user clicks it a dialog pops up saying 'click'" and going up to "there is a memory leak in this ~100 line command line program. Find it and fix it". They were asked to talk me though what they were doing, and while most problems followed each other from the same based, they started with a "perfect" solution to the previous ones at each step so that we didn't deviate too far.
I was pleasantly surprised at how effective the "brown M&Ms" question was, and how predictive the series of programming tasks was.
https://www.insider.com/van-halen-brown-m-ms-contract-2016-9
I've been on both sides of hiring at this point. On the applicant side, I have never seen any indication that anyone has ever read my cover letters. Writing them is a chore. And though my sample size is very limited, I have never had success with bespoke cover letters/cold emails/etc.; the time has always been better spent on reaching more people.
On the hiring side, I've read a few cover letters. Nothing has ever stood out. I read it over once and that's that. Honestly I feel like it can only hurt you. What kind of powerful, moving statement could you possibly write that would persuade someone to give you a chance when you otherwise had none? I'm sure it's happened, but to force people to write these things at the cost of millions of man-hours, just to cover this absurdly rare and mythical case? And on the other side, there are so many things you could do in a cover letter that would give a _negative_ impression. Maybe the tone is inappropriate, or there are inadvertent grammatical errors, or it's written poorly, and on and on and on. Just more exposed surface area for the naturally critical interviewer's mind to attack.