Just wondered why Adobe have never built their own colour wheel picker into Photoshop? Add-on extensions such as Magic Picker and Coolorus are obviously popular, so why can't adobe include this as part of their standard build? Ps. I'm aware of the HUD Picker (shift/Alt/Right Click) - but I don't find it as useful as a dedicated colour picker panel.
they probably haven't included it because they're aware that there are add-ons available. They probably still see themselves as primarily a graphics editing software first, and a painting software second. So that's why it might not be a priority.