I understand your point, once you have absorbed the Apple logic it is reinforced continually and makes sense. But opening a dialog near the use interaction point is a very reasonable expectation.
For me, I’ve never noticed any logic to it, I just know I need to hunt for it.
Colors is not just a dialog! It's a standalone application opening in a new window which you can open just like all other applications on macOS and also remembers the last opened place.
I understand your point, once you have absorbed the Apple logic it is reinforced continually and makes sense. But opening a dialog near the use interaction point is a very reasonable expectation.
For me, I’ve never noticed any logic to it, I just know I need to hunt for it.