So now there are two standards that are mutually exclusive--"works in every light made in the last hundred years" and "the other one".

I sense great commercial success here, telling people to run LV to every HV can light. And how about--you know--a lamp? Like the one standing on my floor right now, with nowhere to place an external box? Should we redesign them all for this new standard that doesn't address actual pain points? How do we power the control boxed? Does every lamp now have a chaining 120V and you need to hang an AC adapter off it, then weasel control wires into the lamp shade? Or do we expect them to output 12V in case you want to run them with automated controls? Or do we expect them to just pick a vendor, build in their control box and you throw out the lamp if the software sucks? In a lamp?

This solves a problem people don't have through the time-tested strategy of making people think more, do more work, and be more annoyed. I think I'm seeing why it doesn't exist.

I am talking about permanent fixtures here. And anyway, there ARE 12VDC lights without a bunch of electronics junk inside them. They're readily available for folks and designers who want _really_ _nice_ lighting.

Having different protocols for inbuilts and furnishings does not seem like a recipe for success.

(And yes, I know about 12VDC lights; I have a studio full of them, with DMX controls. They're not consumer-friendly.)