Well I gave it a try. Set up a Raspberry Pi with Home Assistant, installed the ZHA integration and tried to connect my Philips Hue light bulbs directly to Skyconnect on ZHA. So far, so good. Using a cloud a tunnel on a custom domain I managed to create my own Alexa skill and could import the entitities from ZHA including a group of three Philips Hue color light bulbs.
Now the sad part: They go on and off with a nice transition (400 ms I guess, standard) but when you change colors by voice command (“Alexa, set group to red”) or when you change the group’s brightness (“Alexa, set group to 50%”), even when you manually change these things in the Alexa app… there is no transition. Looks awful. Is it still not possible in 2023 to give these lights a standard transition in ZHA? Is there a workaround, anything? Because this seems like a deal breaker to me and I would rather go back to the Hue integration than having these harsh light state changes.