Those flickering LED brake lights are especially rough to be around.
I agree those are awful!
The flickery LED headlights are a common occurence on cars with daytime running lights. It's caused by the vehicles electrical system as most of the factory DRL systems do not always run at full voltage .
Thinking about it, I've only seen headlight flicker in daytime, so it probably is a DRL thing
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If they want to do things the cheap way (pulsing as opposed to actually lowering the voltage) they could atleast do it at a higher frequency where it wouldn't be noticeable (60hz or whatever they use is a bad choice .lol. )