One of my least favorite things about my apartment is the light fixture in the living room. It's this hideous five ring chandelier which looks like it should belong in an uncool nightclub. Mine is actually a little plainer, with solid sides on the rings instead of glass, but you get the idea.
Aside from being ugly, it was also an awful light: too bright, too harsh, too blue, and with no easy way to fix any of that. And then the rings started burning out. At first I didn't mind, because with one or two rings out the light was actually tolerable, but then we got down to one ring remaining and the room was just too dark.
I had some free time so I decided to take a look at this, and there are circular LED strips inside the rings, which are wired into little plastic transformer boxes in the pillars, which are finally tied into a single wire nut up top that links into the house's wiring. I don't have a multimeter to test it, but my guess is the transformers burnt out because they're a cheap part.
Fixing them would require unmounting the light, disassembling the entire fixture, figuring out what capacitor or coil had gone bad, getting parts that are in spec, being handy with a soldering iron, and then putting everything back together, to get a light I hate.
So I bought one of the standard 'glass nipple' light fixtures and put it up there instead with a couple of ordinary A19 LEDs. No one is going to be complementing me on my bold design choices, but it cost $20, there's four parts, and if I don't like the bulbs I can swap them out in two minutes.
The Edison screw fixture is about as old as connectors get, and we'd never design it that way if we were starting from scratch, but they're perfectly serviceable, LED bulbs are fantastic, and I cannot rightly comprehend the engineering sensibilities of selling people light fixtures that have crap components that break and are impossible to fix.