This might be something insignificant for most users but I was so used to it that it pierced my eye the first time I saw it. Why was the origin point changed to a black and white circle? I liked it so much when it was yellow. I thought it had philosophy behind the design and the decision of the colour yellow - to me its shape and colour resembled the Sun and since it shows up only at the origin, it really seemed like the "centre of the Solar System".
The current colour choice looks like a black hole. This is purely subjective but I thought I'd share my opinion anyway, since I miss the yellow Sun when I work in 2017. Hope it will be brought back in the future versions.
Before SketchUp 2017
After SketchUp 2017
As an alternative workaround, maybe under the Accessibility tab from SketchUp 2017 a separate option could be offered for the inference point colours as well.