This has been a peeve of mine for years. I recently added support for default transitions in light profiles in the last release, which is a nice stop-gap, but it has two major downsides:
- You must specify a color along with it. So it won’t retain the bulb’s previous state, and you can’t transition between two colors.
- It only works for turning a bulb ON, not off. So it feels incomplete.
You can also set transitions in scenes, but that won’t work for one-off light change requests (e.g. “Alexa, set living room lights to blue”).
As a dev, I know things are often much harder than they seem, but it does seem pretty simple for the aesthetic benefit – that “smart home feel” that comes with lights fading in and out in unison.