LEDs on bikes can be just as bad, have been dazzled by them plenty of times.
They are also very misleading.
As pretty much point sources. at nighttime, they convey little or no distance information.
Is that cyclist 50 yards away, or 10ft??
Or as happened with me last winter as I pulled out into an unlit mini roundabout.
Those two bright LED lights side by side were not, in fact, an approaching vehicle some considerable distance away, but a cyclist who was actually already on the roundabout.
No impact fortunately, but I bet he will have been convinced that he had done all the right things to make himself visible and was puzzled that he hadn't been "Seen"
There was a reason why bike lighting was regulated and standardised. Other road users would be able to identify cyclists at night by their lighting and tell how far away they are by virtue of the relative brightness.
None of this applies today. It is completely random. :/
On a few occasions in the dark mornings I have seen (barely) people walking, running or cycling in dark clothes and have only seen them at the last minute. It showed how easily this kind of incident can occur.
The other problem with the car lights, is that the modern ones have a much sharper cut off when on dipped beam. With traditional lights there was usually sufficient bleed so that despite the beams being directed at the road. One could still make out objects much further away than 25 yards.
With the LED ones, there is basically a lit area, and an unlit area. Objects, like people, in the unlit area remain invisible until you get close enough for them to be illuminated by the dipped beams. Which isnt really very far away.
It begs the question about how fast should one travel in dipped beams.
"Strict" interpretation of rules of safety, assuming a visible horizon of 25 yards would suggest that the maximum "Safe" speed on dipped lights on an unlit road would only be around 20Km/Hr
Anything faster than this and you are trusting to fate that the road ahead will be clear!