There is a fundamental awfulness to the old school methods for 'remote control' of lighting based on messing with the AC waveform being fed to the light 'bulb'. This was all we had for many decades dating back to lighting control in theatres using Variacs or potentiometers,

The electronic Triac based AC 'dimmers' worked well enough with incandescent filament bulbs by chopping portions of the AC waveform away, reducing the average power delivered to the hot filament. Sometimes there was visible flicker or shimmer but mostly this worked well enough.

Then the arrival of 'transformer' powered 12 volt Halogen complicated things as the Triac devices fought with the magnetic transformers. This begat 'magnetic' compatible dimmers. Then came 'electronic' transformers and yet again fancier dimmers to manage the hacked up AC waveform in a manner that the downstream electronics could cope with. Not perfect with flickering, incomplete dimming and delayed starting being fairly common issues. CFL lamps have similar issues.

LED lighting can be so low power that it messes with the basic premise of inline Triac dimming where the dimmer itself leeches power from the current flow to the load. When the lighting becomes very low power the dimmer often cannot sustain itself without consuming a large percentage of the total power to the load. Result is incorrect dimming, flicker or other problems.

In my view the whole idea of managing lighting by messing with the electrical supply to the 'lamp' is no longer viable. The lamp itself needs to manage its own power levels and brightness and be able to accept remotely issued commands for changes in brightness. This is of course what is happening with 'smart' lights and lamps, but overall we are a long way away from widespread implementation of this approach.

Lighting is one of a few things where there is this idea that it is ok to corrupt the AC power waveform feeding the thing. We do not dim our TV or adjust the volume of the sound system by messing with the AC input.

It will be a bumpy road from where we are currently with household AC wiring to reach an intelligently configured future where the power provided to all devices is clean and uncorrupted, including those devices providing lighting.

I had not realized that the US electrical code had been changed to require AC neutral conductor in new construction switch boxes, since 2011. This will allow for more stable operation of the dimmer controller itself but does not address the underlying problem of bizarre and potentially incompatible waveforms being delivered to the downstream lighting devices. Not to mention the undesired results from inadvertently 'dimming' a non-lighting device such as a TV.