I didn’t have color blubs for a long time, so I didn’t care much about the color picker. Now I used it for a few weeks and when I first used the color picker in the official Tradfri app it felt so much more comfortable.
If you want a specific color, you just press the suited button. And the slider makes sense to me: Left = 0%, right = 100% brightness.
While I understand the concept of HSV and thus the meaning of the two sliders in the current picker, it doesn’t feel intuitive. If I want to change from blue to warm white, I have to select yellow/orange and change the upper slider. And why is the lower slider 100% - 0% brightness and not the other way round.
I can think of a good compromise: Like the color picker in the first post, but my color picker as the preset one (a few white tones need to be added) and the old color picker as the custom one. And the picker remembers the last state (custom or preset).