Maybe you have to have started riding back in the stone age to appreciate them, but modern bike lights are fantastic!
When I think of the junk I've had to have on my bikes over the years... cheap pot metal parts to hold tail-lights on, generators that scraped up my tires, extra bulbs carried at all times because they blew out so often, heavy batteries, both chargeable and not, both generators and chargeable batteries that abruptly quit working in the middle of a ride despite following all of the manufacturers instructions.
Now, there is the LED light. Works for hundreds of hours on two AA batteries...weighs next to nothing... costs so little I can have a headlight on either side of my stem, one high-beam and one aimed low. These little gadgets are the best!