[cwillu]

You absolutely can dim an LED via constant current control. Nobody does it that way at scale, but the LEDs work that way just fine.

Source: I have a 5-way constant-current dimmer on a breadboard on my desk driving 5 CREE XLamp CXA Series LED's.

[wlesieutre]

Nobody does it that way in screw-base retrofit bulbs, but there's a whole world of commercial lighting where constant current is pretty widely used.

Drivers from vendors such as Tridonic https://www.tridonic.com/en/int/product-finder/led-drivers?f...

Advantages include lack of flicker and more reliable LED boards (hardly any components except for the LEDs). Drivers still fail, but it's nice to have them be a replaceable part.