Ring300.png looks like a standstill approach circle outside the circle, the area outside of ring300.png are 100,50 and early miss, the 300 area is inside of ring300.png, that means the higher AR and lower OD the bigger ring300.png
part of what makes rhythm games challenging is knowing when to hit notes based on the rhythm. once you add more visual aid on when to hit notes, it becomes less about rhythm and more about reactions. approach circles already give you enough visual aid as it is, we don't need anymore.