Hello,
I’m currently using MQTT lights and xiaomi_miio lights. Both have color temperature and/or brightness sliders. I think it would be really nice to have instant feedback on your lights, when moving the slider. That means the light should change, while using the slider instead of on release of the slider. That way you could better find the right value for the lights.
My MQTT Light also has RGB and the RGB Color Picker has an instant feedback on my lights, so it should also be possible for brightness and color temperature.