I'd say it's a retrograde trend dressed up as fashion.Neither, for that matter, does it benefit motorists in many circumstances.... On a busy road, all you can see is the glare of the lights, with little chance of picking out any detail behind them. The lighting arms race is a retrograde trend dressed up as progress. A bit like plastic packaging, on which, all of a sudden, majority opinion has switched - so there's hope for our roads yet.
The manufacturers are creaming themselves over their vehicles' 'distinctive LED signatures'.
I find them hugely disruptive in a daylight setting, it's like they suck out of view everything that's behind them. A truly backward step in holistic safety.