Correct, it is that exposed colour.
I’m not sure how the colours are picked and assigned by the devs.
It just came to my attention and seemed a good idea to point this out.
I know people can change it manually or choose a different theme but I felt that optimizing this for the default blender theme could only be beneficial. Maybe it’s just as simple as changing the brightness or intensity of the colour to stand out more from the mid greys. The shader node for example is a better shade of readable green and will never be used in conjunction with the geometry nodes.
Just my 2 cents