I never tooted about this but Consumer Reports picked up on my video and made a more professional stink about my car's brake lights!
https://www.consumerreports.org/cars/car-safety/brake-lights-can-fail-to-provide-fair-warning-on-some-evs-a9533519285/

And now! Hyundai just announced they will do a "field service campaign" to fix the issue starting in July. Yay!

Brake Lights Can Fail to Provide Fair Warning on Some Electric Vehicles

In Consumer Reports' tests, the brake light on some Genesis, Hyundai, and Kia EVs don’t always illuminate as the vehicle decelerates during regenerative braking.

Consumer Reports
@TechConnectify A curious thing I've noticed is there's been a handful of occasions where I've had to slam on my breaks when following behind a Tesla because they slowed significantly w/o showing break lights, so even the accelerometer based method isn't flawless.

@TechConnectify When I've mentioned this elsewhere I usually get a handful of Tesla-hards jumping down my throat about me being wrong and demanding proof.

Sorry, I don't have a dash cam. Though Tesla break lights are so small and dim it is plausible it's just because I couldn't see them when they're being illuminated by sunlight. But that's a different issue.